GTK: Shave ~15ms off each tab change.
GTK: Shave ~15ms off each tab change.

Reparenting the bookmark bar on each tab change whether it needs it or not
costs about 15ms. This usually is enough savings to get one more frame out of
the new tab animation early on.

Also, it's the Browser object's responsibility to update our toolbar; remove a duplicate call that already happened before the BrowserWindowGtk::ActiveTabChanged() Observer method was called.

BUG=83106
TEST=Everything works about the bookmarks bar when changing tabs

Review URL: http://codereview.chromium.org/8537022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109928 0039d316-1c4b-4281-b951-d872f2087c98

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