Fix the crop tool when resizing.

The crop rectangle has to be updated when resizing the window. This patch does that by listening to the onresize event within the cropping tool class.

TEST=Tested manually. Open a picture, try to crop. Then resize the window. The crop rectangle should reflect the new window size.
BUG=284946

Review URL: https://codereview.chromium.org/26445002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227668 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227668