History: Disable the 'remove' button after it's clicked.
History: Disable the 'remove' button after it's clicked.


BUG=73197
TEST=Remove an item from history and check that the remove button should be brought back to disabled state when no more items are selected for deletion.


Review URL: http://codereview.chromium.org/8341006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@106261 0039d316-1c4b-4281-b951-d872f2087c98

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