[Xcode] Update some build settings as recommended by Xcode 7

[Xcode] Update some build settings as recommended by Xcode 7
https://bugs.webkit.org/show_bug.cgi?id=146597

Reviewed by Sam Weinig.

Source/bmalloc:

* Configurations/Base.xcconfig: Enabled CLANG_WARN_UNREACHABLE_CODE, GCC_NO_COMMON_BLOCKS,
and ENABLE_STRICT_OBJC_MSGSEND. Removed GCC_MODEL_TUNING.

* bmalloc.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

Source/JavaScriptCore:

* Configurations/Base.xcconfig: Enabled CLANG_WARN_UNREACHABLE_CODE and
GCC_NO_COMMON_BLOCKS. Removed GCC_MODEL_TUNING.

* JavaScriptCore.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

* dfg/DFGGraph.h: Tweaked the definition of DFG_CRASH to suppress unreachable code warnings.

Source/ThirdParty/ANGLE:

* ANGLE.xcodeproj/project.pbxproj: Enabled CLANG_WARN_BOOL_CONVERSION,
CLANG_WARN_ENUM_CONVERSION, CLANG_WARN_INT_CONVERSION, ENABLE_STRICT_OBJC_MSGSEND and
GCC_NO_COMMON_BLOCKS.

* Configurations/Base.xcconfig: Updated LastUpgradeCheck.

Source/WebCore:

* Configurations/Base.xcconfig: Enabled CLANG_WARN_UNREACHABLE_CODE,
GCC_WARN_UNDECLARED_SELECTOR, and GCC_NO_COMMON_BLOCKS. Removed GCC_MODEL_TUNING.

* WebCore.xcodeproj/project.pbxproj: Updated LastUpgradeCheck. Disabled -Wunreachable-code
for two bison-generated source files. Updated for rename of WebScriptObject.h.

* bindings/objc/WebScriptObject.mm:
(-[WebUndefined dealloc]): Removed unreachable code and suppressed warning about not calling
super.
* bridge/objc/WebScriptObject.h: Renamed to WebScriptObjectProtocol.h to enabled inlcuding
the other WebScriptObject.h.
* bridge/objc/WebScriptObjectProtocol.h: Renamed from WebScriptObject.h.

* bridge/objc/objc_class.mm: Updated for rename and included WebScriptObject.h because we
use selectors declared in that file.

* bridge/objc/objc_instance.mm: Ditto.
(ObjCRuntimeMethod::create): Resolved ambiguity between JSC::JSValue and the Objective-C
JSValue class.
(ObjCRuntimeMethod::createStructure): Ditto.
(ObjcInstance::invokeMethod): Ditto.
(ObjcInstance::invokeObjcMethod): Ditto.
(ObjcInstance::invokeDefaultMethod): Ditto.
(ObjcInstance::setValueOfUndefinedField): Ditto.
(ObjcInstance::getValueOfUndefinedField): Ditto.
(ObjcInstance::defaultValue): Ditto.
(ObjcInstance::stringValue): Ditto.
(ObjcInstance::numberValue): Ditto.
(ObjcInstance::booleanValue): Ditto.
(ObjcInstance::valueOf): Ditto,

* bridge/objc/objc_runtime.h: Moved definition of isFallbackMethod() from here to the
implementation.
* bridge/objc/objc_runtime.mm: Updated for rename and included WebScriptObject.h because we
use selectors declared in that file.
(JSC::Bindings::ObjcMethod::isFallbackMethod): Moved definition from the header to here.

* bridge/objc/objc_utility.mm: Updated for rename.

* cssjit/SelectorCompiler.cpp:
(WebCore::SelectorCompiler::addScrollbarPseudoClassType): Removed unreachable code.

* platform/graphics/mac/MediaPlayerPrivateQTKit.mm:
Added declarations to the WebCoreMovieObserver interface.
(WebCore::MediaPlayerPrivateQTKit::disableUnsupportedTracks): Suppressed
-Wundeclared-selector around invocation of a selector that is not declared anywhere.

Source/WebInspectorUI:

* Configurations/Base.xcconfig: Enabled CLANG_WARN_UNREACHABLE_CODE and
GCC_NO_COMMON_BLOCKS.
* WebInspectorUI.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

Source/WebKit:

* WebKit.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

Source/WebKit/mac:

* Configurations/Base.xcconfig: Enabled CLANG_WARN_UNREACHABLE_CODE,
GCC_WARN_UNDECLARED_SELECTOR and GCC_NO_COMMON_BLOCKS. Removed GCC_MODEL_TUNING.

Source/WebKit2:

* Configurations/Base.xcconfig: Enabled CLANG_WARN_UNREACHABLE_CODE and
GCC_NO_COMMON_BLOCKS. Removed GCC_MODEL_TUNING.

* WebKit2.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

Source/WTF:

* Configurations/Base.xcconfig: Enabled CLANG_WARN_UNREACHABLE_CODE and
GCC_NO_COMMON_BLOCKS. Removed GCC_MODEL_TUNING.

* WTF.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

Tools:

* DumpRenderTree/DumpRenderTree.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

* DumpRenderTree/mac/Configurations/Base.xcconfig: Enabled GCC_NO_COMMON_BLOCKS,
ENABLE_STRICT_OBJC_MSGSEND, CLANG_WARN_BOOL_CONVERSION, CLANG_WARN_CONSTANT_CONVERSION,
CLANG_WARN_EMPTY_BODY, CLANG_WARN_ENUM_CONVERSION, CLANG_WARN_INT_CONVERSION,
CLANG_WARN_UNREACHABLE_CODE, GCC_WARN_ABOUT_RETURN_TYPE,
GCC_WARN_UNINITIALIZED_AUTOS, and GCC_WARN_UNDECLARED_SELECTOR.

* DumpRenderTree/mac/EventSendingController.mm:
(+[EventSendingController webScriptNameForSelector:]): Removed check for setDragMode:,
which was removed in r19101.

* DumpRenderTree/mac/TextInputController.m:
(-[TextInputController interpretKeyEvents:withSender:]): Suppressed -Wundeclared-selector
around used of a selector not that is not declared anywhere.

* MiniBrowser/Configurations/Base.xcconfig: Enabled GCC_NO_COMMON_BLOCKS.

* MiniBrowser/MiniBrowser.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

* TestWebKitAPI/Configurations/Base.xcconfig: Enabled GCC_NO_COMMON_BLOCKS,
ENABLE_STRICT_OBJC_MSGSEND, CLANG_WARN_BOOL_CONVERSION, CLANG_WARN_CONSTANT_CONVERSION,
CLANG_WARN_EMPTY_BODY, CLANG_WARN_ENUM_CONVERSION, CLANG_WARN_INT_CONVERSION,
CLANG_WARN_UNREACHABLE_CODE, GCC_WARN_ABOUT_RETURN_TYPE,
GCC_WARN_UNINITIALIZED_AUTOS, and GCC_WARN_UNDECLARED_SELECTOR.

* TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj: Updated LastUpgradeCheck.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186268 268f45cc-cd09-0410-ab3c-d52691b4dbfc