[extensions] Position browser action popup correctly for RTL languages.
[extensions] Position browser action popup correctly for RTL languages.

ExtensionPopup::Show was hard coded to use BubbleBorder::TOP_RIGHT, by changing it to be dynamic that depends on UI Layout fixes this issue.

BUG=29807
TEST=Change chrome language to Arabic, install Sidewiki, the popup will position itself correctly.

Review URL: http://codereview.chromium.org/494008

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@34491 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser