GitLab

Return NSDragOperationCopy for BookmarBarButton drags and NSDragOperationMove
for other drag types. Updated unit tests to set a BookmarkBarButton as the
mock |draggingSource| for bookmark bar dragging tests and made the tests
check for the expected drag operation type.

BUG=83228
TEST=Drag a link from a page and hover over the BMB. Cursor should be a (+).
Drag a bookmark button. Cursor shouldn't be a (+).

Review URL: http://codereview.chromium.org/7048009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86696 0039d316-1c4b-4281-b951-d872f2087c98