win: Drop extra triangles in triangle fan used to flip image transport surface.

BUG=135546

Review URL: https://chromiumcodereview.appspot.com/10843020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149362 0039d316-1c4b-4281-b951-d872f2087c98

ui/surface/accelerated_surface_win.cc

@@ -820,7 +820,7 @@ void AcceleratedPresenter::DoPresentAndAcknowledge(
 
     present_thread_->device()->BeginScene();
     present_thread_->device()->DrawPrimitiveUP(D3DPT_TRIANGLEFAN,
-                                               arraysize(vertices),
+                                               2,
                                                vertices,
                                                sizeof(vertices[0]));
     present_thread_->device()->EndScene();