GitLab

Few changes involved:

1) Using TestBookmarkClient to create BookmarkModel.
2) Removes unnecessary TestBrowserThreadBundle
3) With the above changes TestingProfile and BookmarkModelFactory
goes away.

BUG=367834
TEST=components_unittests --gtest_filter=BookmarkModel*
R=blundell@chromium.org, sdefresne@chromium.org

Review URL: https://codereview.chromium.org/291503007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271064 0039d316-1c4b-4281-b951-d872f2087c98