Disable context menu for downloads page.
Disable context menu for downloads page.

BUG=chromium-os:16138
TEST=ctrl-j to launch downloads tab. Right click should no longer do anything.

Review URL: http://codereview.chromium.org/7046116

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@89379 0039d316-1c4b-4281-b951-d872f2087c98

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