One-click signin bubble: Prepend "You're now signed in to Chromium" message on
GTK.

Previously (as a result of a string change made in Issue 107673002) the bubble
would omit this part of the message on GTK. This issue restores it for GTK.

BUG=337571

Review URL: https://codereview.chromium.org/139853015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246914 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246914
Add ability to enable / disable overscroll in about:flags

This will allow us to enable overscroll by default on one platform only.
BUG=None
TEST=None
R=jam@chromium.org

Review URL: https://codereview.chromium.org/137203012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246915 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246915