Finally rip the global StackingClient bandaid off.

- Removes the aura::client::SetStackingClient(StackingClient*) interface.
- Moves the ash StackingController from a singleton owned by ash::Shell to one StackingController per RootWindow owned by the ash::RootWindowController. (Also removes a spurious delegate method, where every implementation creates the same object, including tests.)
- Removes the global DesktopStackingClient and related interfaces.
- Fix the ChromeViewsDelegate so that it still sets context in chromeos builds.
- Rename content::ShellStackingClientAsh to content::MinimalAsh to reflect what it really does.

In addition, the following fix ups apply:

- Previously, WebContentsViewAura asserted that it needed a context window. Now if no context window is provided, it isn't added to an aura hierarchy. There are times when that context doesn't exist: various chromeos dialogs that directly invoke WebView and toplevel extension/app windows that are created from background pages that don't have contexts.
- Because of that, added a few of NULL checking to RenderWidgetHostViewAura. (Other methods NULL checked Window::GetRootWindow(), but there were a few that didn't and relied on the old NULL means lookup in the StackingClient behaviour.)

BUG=161882

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=177182

Review URL: https://codereview.chromium.org/11829040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@178083 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 1 deletions

diff --git a/ash/test/test_shell_delegate.h b/ash/test/test_shell_delegate.h
index 76add5d..3b0ee76 100644
--- a/ash/test/test_shell_delegate.h
+++ b/ash/test/test_shell_delegate.h
@@ -67,7 +67,6 @@ class TestShellDelegate : public ShellDelegate {
   virtual void SaveScreenMagnifierScale(double scale) OVERRIDE;
   virtual double GetSavedScreenMagnifierScale() OVERRIDE;
   virtual ui::MenuModel* CreateContextMenu(aura::RootWindow* root) OVERRIDE;
-  virtual aura::client::StackingClient* CreateStackingClient() OVERRIDE;
   virtual RootWindowHostFactory* CreateRootWindowHostFactory() OVERRIDE;
 
   int num_exit_requests() const { return num_exit_requests_; }