Only export a single WebKitMain function for the Web Process to call

Only export a single WebKitMain function for the Web Process to call
https://bugs.webkit.org/show_bug.cgi?id=41702

Reviewed by Sam Weinig.

* Shared/CommandLine.h:
Add windows CommandLine::parse overload.

* Shared/win/CommandLineWin.cpp: Added.
(WebKit::CommandLine::parse):
Move parse overload from WebProcess/win/WebProcessMain.cpp.

* UIProcess/Launcher/win/ProcessLauncherWin.cpp:
(WebKit::ProcessLauncher::launchProcess):
Pass the right mode to.

* WebKit2.xcodeproj/project.pbxproj:
Update for moves.

* WebProcess/Launching/mac/WebProcessMain.mm: Removed.
* WebProcess/Launching/win/WebProcessWinMain.cpp: Removed.
* WebProcess/WebKitMain.cpp: Added.
(WebKitMain):
(enableTerminationOnHeapCorruption):
Add WebKitMain functions for Mac and Windows.

* WebProcess/WebProcessMain.h: Added.
* WebProcess/mac/WebProcessMainMac.mm: Added.
(WebKit::WebProcessMain):
Add Mac version of WebProcessMain.

* WebProcess/win/WebProcessMain.cpp: Removed.
* WebProcess/win/WebProcessMain.h: Removed.
* WebProcess/win/WebProcessMainWin.cpp: Added.
(WebKit::WebProcessMain):
Add Windows version of WebProcessMain.

* mac/MainMac.cpp: Added.
(main):
Add Mac WebProcess main function.

* mac/WebKit2.exp:
Remove functions that we don't need to export.

* win/MainWin.cpp: Added.
(wWinMain):
Add Windows WebProcess main function.

* win/WebKit2.vcproj:
* win/WebKit2WebProcess.vcproj:
Update for moves.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@62560 268f45cc-cd09-0410-ab3c-d52691b4dbfc