Switch Copy implementation from JS to HTML5 based C++ private API.

This CL switches the copy operation for Files.app from JS's one to C++'s.
Note that this just does switching. Unused code clean up will be done in
following CLs.

BUG=261492
TEST=Ran browser_tests --gtest_filter="*FileSystemExtensionApiTest*:*FileManagerBrowserTest*:*FileBrowserPrivateApiTest*" and tested manually.

Review URL: https://codereview.chromium.org/24987002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225915 0039d316-1c4b-4281-b951-d872f2087c98
Move minimized windows to the back of the most recently used window list.

BUG=299817
TEST=MruWindowTrackerTest.MinimizedWindowsAreLru
TEST=Open windows in order A, B, C. Minimize C, then alt-tab and expect to get to A rather than back to C.

Review URL: https://codereview.chromium.org/24999006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225916 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225916