Fix compilation of browser_window_cocoa_unittest.mm with OS X 10.11 SDK.

Fix compilation of browser_window_cocoa_unittest.mm with OS X 10.11 SDK.

Fixes the following compilation error:
../../testing/gtest/include/gtest/gtest.h:1526:28: error: comparison of integers of different signs: 'const unsigned long' and 'const long' [-Werror,-Wsign-compare]
GTEST_IMPL_CMP_HELPER_(NE, !=);
~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
../../testing/gtest/include/gtest/gtest.h:1514:12: note: expanded from macro 'GTEST_IMPL_CMP_HELPER_'
  if (val1 op val2) {\
      ~~~~ ^  ~~~~
../../chrome/browser/ui/cocoa/browser_window_cocoa_unittest.mm:65:3: note: in instantiation of function template specialization 'testing::internal::CmpHelperNE<unsigned long, long>' requested here
  EXPECT_NE([bwc->WindowTitle() rangeOfString:playing_emoji].location,
  ^

BUG=None

[sdefresne, 2015-11-06 10:49:48]

sdefresne@chromium.org changed reviewers:
+ shess@chromium.org

[sdefresne, 2015-11-06 10:49:48]

Please take a look.

[Scott Hess - ex-Googler, 2015-11-06 14:25:07]

LGTM (w/eyeroll at SDK developers).

https://codereview.chromium.org/1411043009/diff/1/chrome/browser/ui/cocoa/bro...
File chrome/browser/ui/cocoa/browser_window_cocoa_unittest.mm (right):

https://codereview.chromium.org/1411043009/diff/1/chrome/browser/ui/cocoa/bro...
chrome/browser/ui/cocoa/browser_window_cocoa_unittest.mm:61:
static_cast<NSUInteger>(NSNotFound));
EXPECT_EQ() is supposed to be ordered expected, then actual.  Could you swap
these while you're here?

[sdefresne, 2015-11-12 09:08:33]

Original CL was reverted (https://codereview.chromium.org/1412803012), closing.