Unify blob related feature defines to ENABLE(BLOB).

Unify blob related feature defines to ENABLE(BLOB).
https://bugs.webkit.org/show_bug.cgi?id=43081

Reviewed by David Levin.

.:

* cmakeconfig.h.cmake:
* configure.ac:

JavaScriptCore:

* Configurations/FeatureDefines.xcconfig:

WebCore:

* Configurations/FeatureDefines.xcconfig:
* GNUmakefile.am:
* WebCore.pri:
* bindings/js/JSEventTarget.cpp:
(WebCore::toJS):
* bindings/v8/V8DOMWrapper.cpp:
(WebCore::V8DOMWrapper::convertEventTargetToV8Object):
* dom/EventTarget.cpp:
* dom/EventTarget.h:
* dom/ExceptionCode.h:
(WebCore::):
* dom/ScriptExecutionContext.cpp:
(WebCore::ScriptExecutionContext::~ScriptExecutionContext):
* dom/ScriptExecutionContext.h:
* html/Blob.cpp:
* html/Blob.h:
* html/Blob.idl:
* html/FileError.h:
* html/FileError.idl:
* html/FileReader.cpp:
* html/FileReader.h:
* html/FileReader.idl:
* html/FileStream.cpp:
(WebCore::FileStream::openForRead):
* html/FileStream.h:
* html/FileStreamClient.h:
* html/FileStreamProxy.cpp:
* html/FileStreamProxy.h:
* html/FileThread.cpp:
* html/FileThread.h:
* page/DOMWindow.idl:
* platform/BlobItem.cpp:
(WebCore::getFileSnapshotModificationTime):
(WebCore::DataBlobItem::slice):
(WebCore::FileBlobItem::slice):
* platform/BlobItem.h:
* platform/network/FormData.cpp:
(WebCore::FormData::deepCopy):
(WebCore::FormData::appendFile):
(WebCore::FormData::appendItem):
(WebCore::FormData::appendKeyValuePairItems):
* platform/network/FormData.h:
(WebCore::operator==):
* platform/network/mac/FormDataStreamMac.mm:
(WebCore::closeCurrentStream):
(WebCore::advanceCurrentStream):
(WebCore::formCreate):
(WebCore::formRead):
(WebCore::setHTTPBody):

WebKit/chromium:

* features.gypi:
* src/WebHTTPBody.cpp:
(WebKit::WebHTTPBody::elementAt):
(WebKit::WebHTTPBody::appendFileRange):

WebKit/mac:

* Configurations/FeatureDefines.xcconfig:

WebKit2:

* Configurations/FeatureDefines.xcconfig:

WebKitLibraries:

* win/tools/vsprops/FeatureDefines.vsprops:
* win/tools/vsprops/FeatureDefinesCairo.vsprops:

WebKitTools:

* Scripts/build-webkit:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@64763 268f45cc-cd09-0410-ab3c-d52691b4dbfc