Use correct coordinates for last moust location in SynthesizeMouseMoveEvent

BUG=139236
TEST=see bug description

Review URL: https://chromiumcodereview.appspot.com/10821060

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148834 0039d316-1c4b-4281-b951-d872f2087c98

ui/aura/root_window.cc

@@ -988,7 +988,7 @@ void RootWindow::SynthesizeMouseMoveEvent() {
   synthesize_mouse_move_ = false;
 #if !defined(OS_WIN)
   // Temporarily disabled for windows. See crbug.com/112222.
-  gfx::Point3f point(Env::GetInstance()->last_mouse_location());
+  gfx::Point3f point(GetLastMouseLocationInRoot());
   ui::Transform transform = layer()->transform();
   float scale = ui::GetDeviceScaleFactor(layer());
   transform.ConcatScale(scale, scale);