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bridged_native_widget_unittest.mm currently fails to compile on 10.7+
SDKs because there is no such thing as
NSWindowDidFailToEnterFullScreenNotification (whoops).

The failures don't go through NSNotificationCenter, but to the
NSWindowDelegate protocol directly. So, add a dummy protocol for 10.6
and, in the simulate fullscreen failure test, send
windowDidFailTo{Enter,Exit}FullScreen to the window delegate directly.

Call via `id` so the test compiles on 10.6 SDKs, but return early so the
tests pass when actually running on 10.6.

BUG=378134
TEST=By tracing the simulation test, and manually to generate an actual
failure.

Review URL: https://codereview.chromium.org/665823002

Cr-Commit-Position: refs/heads/master@{#300366}