Fix app icon flicker in loading animation
Fix app icon flicker in loading animation

The flicker is caused by setting window title icon while a loading
animation is in progress. Fix the problem by skipping window icon update
when loading animation is running.

BUG=15782
TEST=Verify no flicker while web app loads per Ben's comments.

Review URL: http://codereview.chromium.org/436028

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@32982 0039d316-1c4b-4281-b951-d872f2087c98

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