Suppress Backspace propagation from docked DevTools into inspected window
Suppress Backspace propagation from docked DevTools into inspected window

BUG=74156
TEST=Select static text in docked DevTools console and hit Backspace. The inspected tab does not navigate back in history.

Review URL: http://codereview.chromium.org/6877122

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@82481 0039d316-1c4b-4281-b951-d872f2087c98

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