Swallow context menu events dispatched to a NPAPI plugin so that WebKit prevents the default context menu from being rendered.
Swallow context menu events dispatched to a NPAPI plugin so that
WebKit prevents the default context menu from being rendered.

Depends on:
https://bugs.webkit.org/show_bug.cgi?id=42808

R=stuartmorgan
BUG=48129
TEST=none

Review URL: http://codereview.chromium.org/2858065

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@53389 0039d316-1c4b-4281-b951-d872f2087c98

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