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, 4 deletions

diff --git a/ash/shell_delegate.h b/ash/shell_delegate.h
index 6a9dd08..11482d5 100644
--- a/ash/shell_delegate.h
+++ b/ash/shell_delegate.h
@@ -22,7 +22,6 @@ namespace aura {
 class RootWindow;
 class Window;
 namespace client {
-class StackingClient;
 class UserActionClient;
 }
 }
@@ -219,9 +218,6 @@ class ASH_EXPORT ShellDelegate {
   // Creates a menu model of the context for the |root_window|.
   virtual ui::MenuModel* CreateContextMenu(aura::RootWindow* root_window) = 0;
 
-  // Creates the stacking client. Shell takes ownership of the object.
-  virtual aura::client::StackingClient* CreateStackingClient() = 0;
-
   // Creates a root window host factory. Shell takes ownership of the returned
   // value.
   virtual RootWindowHostFactory* CreateRootWindowHostFactory() = 0;