[Cherry-pick][Text Autosizing] Simplify computation of screenRect/windowRect.

[Cherry-pick][Text Autosizing] Simplify computation of screenRect/windowRect.

[chromium] Simplify computation of screenRect/windowRect.
https://bugs.webkit.org/show_bug.cgi?id=110456

Patch by John Mellor <johnme@chromium.org> on 2013-02-21
Reviewed by Adam Barth.

This patch removes applyDeviceScaleFactorInCompositor checks
added by http://trac.webkit.org/changeset/139356 because
Chrome for Android now sizes its screen and window in DIP
units (like other platforms), so they are no longer necessary.

Source/WebCore:

No new tests, since this is just removing an unused codepath.

* platform/chromium/PlatformScreenChromium.cpp:
(WebCore::screenRect):
(WebCore::screenAvailableRect):
* rendering/TextAutosizer.cpp:
(WebCore::TextAutosizer::processSubtree):

Source/WebKit/chromium:

* src/ChromeClientImpl.cpp:
(WebKit::ChromeClientImpl::windowRect):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143642 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Conflicts:

	Source/WebCore/ChangeLog
	Source/WebCore/platform/chromium/PlatformScreenChromium.cpp
	Source/WebCore/rendering/TextAutosizer.cpp
	Source/WebKit/chromium/ChangeLog