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On MacViews, the tests ComboboxTest.NotifyOnClickWithSpaceKey and
ComboboxTest.NotifyOnClickWithReturnKey do not terminate currently when run
individually. This only happens on Mac, because on other platforms the combobox
dropdown menu is async (non-blocking). However on Mac, a native NSMenu is used
to show the combobox dropdown, which runs a nested message loop and hence is
blocking.

To solve, install a TestMenuRunner for all the tests using the ComboboxTest
fixture. This ensures that an actual menu is not created.

BUG=679980
TEST= Run out/Default/views_unittests
--gtest_filter="ComboboxTest.NotifyOnClickWithSpaceKey" on Mac. Ensure that the
test terminates normally.

Review-Url: https://codereview.chromium.org/2620963002
Cr-Commit-Position: refs/heads/master@{#443077}