[Mac] Declare NSEventMask as the right size in base_bubble_controller.mm 10.6 SDK forward declares.
[Mac] Declare NSEventMask as the right size in base_bubble_controller.mm 10.6 SDK forward declares.

BUG=119479
TEST=Open a bubble. Chrome doesn't crash.

Review URL: https://chromiumcodereview.appspot.com/9834069

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@128802 0039d316-1c4b-4281-b951-d872f2087c98

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