In the new tab page, when in edit move, right-clicking on a thumbnail should not trigger its deletion.
In the new tab page, when in edit move, right-clicking on a thumbnail should not trigger its deletion.

BUG=10527
TEST=Open the New Tab Page. Click the "Remove thumbnails" link to enter edit mode. Right-click on a thumbnail. The context menu should be displayed and the thumbnail should not be removed.
Review URL: http://codereview.chromium.org/92018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@14290 0039d316-1c4b-4281-b951-d872f2087c98

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