Suppress valgrind error that started with r19701, which...

tools/valgrind/suppressions_mac.txt

 {
    # See http://code.google.com/p/chromium/issues/detail?id=9565
    # This should have been handled by platform-specific suppression.
    # Remove this when https://bugs.kde.org/show_bug.cgi?id=188572 is fixed
    setenv() leaks on Mac intentionally.
    Memcheck:Leak
    ...
    fun:__setenv
    fun:setenv$UNIX2003
 }
@@ skipping 239 matching lines @@
    unitialized_rect_allocated_on_stack_when_reparenting_window_content_views
    Memcheck:Cond
    fun:NSRectClip
    fun:-[NSThemeFrame drawOverlayRect:]
    ...
    fun:-[NSWindow makeKeyAndOrderFront:]
    fun:-[BrowserWindowController setFullscreen:]
    ...
    fun:main
 }
+{
+   # Started failing with r19701 (tc), which enables the ImageOperations test.
+   # TODO(ojan): File a bug once google code comes back online.
+   testing::AssertionResult testing::internal::CmpHelperEQ<unsigned int, unsigned int>(char const*, char const*, unsigned int const&, unsigned int const&) (src/xcodebuild/Debug/test_shell_tests)
+   testing::AssertionResult testing::internal::EqHelper<false>::Compare<unsigned int, unsigned int>(char const*, char const*, unsigned int const&, unsigned int const&) (src/xcodebuild/Debug/test_shell_tests)
+   ImageOperations_CreateMaskedBitmap_Test::TestBody() (src/xcodebuild/Debug/test_shell_tests)
+   testing::Test::Run() (src/xcodebuild/Debug/test_shell_tests)
+}