MacViews: Allows the toolkit-views Manage Passwords Dialog to be used

Both chrome/browser/ui/views/passwords/credentials_selection_view.* and
chrome/browser/ui/cocoa/passwords/credentials_selection_view.* are now
included in the same build target so the cocoa version is renamed.

This CL also enables fake full keyboard access by default on MacOS for the
tests based on InProcessBrowserTest, so that tests don't depend on system
setting of the test machine. This makes those tests more like on other
platforms, similar to how it is done in views_unittests.

BUG= 654115
TEST=interactive_ui_test --gtest_filter=ManagePasswordsBubbleViewTest*
     browser_tests --gtest_filter=ManagePasswordsBubbleDialogViewTest*

Cr-Commit-Position: refs/heads/master@{#466285}
15 files changed