Merge 144791 - Fix tab title fading direction in RTL locales.

Merge 144791 - Fix tab title fading direction in RTL locales.

BUG=134759, 134746
TEST=On Windows, launch chrome.exe with --lang=he and go to http://en.wikipedia.org/wiki/Main_Page. Observe that the text is faded on the right.
Open another tab and go to http://www.bbc.co.uk/arabic/topics/syria/ and observe that the text is faded on the left. Observe the same is true with LTR locales.

Review URL: https://chromiumcodereview.appspot.com/10689013

TBR=asvitkine@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=144983