Avoid resetting the RenderText layout on SetDisplayRect() except when the width changes.
Avoid resetting the RenderText layout on SetDisplayRect() except when the width changes.

BUG=105550
TEST=existing unit tests

Review URL: http://codereview.chromium.org/9923011

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@129794 0039d316-1c4b-4281-b951-d872f2087c98

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