[chromium] CCLayerTreeHostImpl minor code cleanup

[chromium] CCLayerTreeHostImpl minor code cleanup
https://bugs.webkit.org/show_bug.cgi?id=77181

Fix a typo in comments and group functions properly.
Replace duplicated content size code with function.

Patch by Tien-Ren Chen <trchen@chromium.org> on 2012-01-27
Reviewed by James Robinson.

No new tests. No change in behavior.

* platform/graphics/chromium/cc/CCLayerTreeHostImpl.cpp:
(WebCore::CCLayerTreeHostImpl::startPageScaleAnimation):
(WebCore::CCLayerTreeHostImpl::contentSize):
(WebCore):
(WebCore::CCLayerTreeHostImpl::updateMaxScrollPosition):
* platform/graphics/chromium/cc/CCLayerTreeHostImpl.h:
(CCLayerTreeHostImpl):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106158 268f45cc-cd09-0410-ab3c-d52691b4dbfc