Fix Cocoa plugin event model modifier flags
Fix Cocoa plugin event model modifier flags

Per spec (and other implementations) the Cocoa event model uses the Cocoa
modifier flag definitions, not the old Carbon version.

BUG=none
TEST=Click and key event modifiers should work in plugins (e.g., Flash games that use shift-clicking)

Review URL: http://codereview.chromium.org/518035

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@35535 0039d316-1c4b-4281-b951-d872f2087c98

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