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Some methods in the protocol NSWindowDelegate are only declared in an OSX 10.7+
SDK. There is no good way to suppress -Wpartial-availability warnings for
protocols. In BrowserWindowController, redeclare the methods in the private
header. For bridge_native_widget_unittest, use performSelector: to invoke the
methods.

BUG=471823

Review URL: https://codereview.chromium.org/1135333002

Cr-Commit-Position: refs/heads/master@{#330472}