Remove native_stack accessor from StackedPanelCollection

We should not try to access native_stack from other classes. In addition, we don't know which one to return if StackedPanelCollection is going to have more than one native stack window in the future.

BUG=223155
TEST=existing tests

Review URL: https://codereview.chromium.org/13999008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195229 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/panels/panel_manager.cc

@@ -11,7 +11,6 @@
 #include "base/message_loop.h"
 #include "chrome/browser/ui/panels/detached_panel_collection.h"
 #include "chrome/browser/ui/panels/docked_panel_collection.h"
-#include "chrome/browser/ui/panels/native_panel_stack_window.h"
 #include "chrome/browser/ui/panels/panel_drag_controller.h"
 #include "chrome/browser/ui/panels/panel_mouse_watcher.h"
 #include "chrome/browser/ui/panels/panel_resize_controller.h"
@@ -325,7 +324,7 @@ PanelCollection* PanelManager::GetCollectionForNewPanel(
         continue;
 
       // Do not add to the stack that is minimized by the system.
-      if (stack->native_stack()->IsMinimized())
+      if (stack->IsMinimized())
         continue;
 
       if (bounds.height() <= stack->GetMaximiumAvailableBottomSpace()) {

chrome/browser/ui/panels/stacked_panel_collection.cc

@@ -604,6 +604,10 @@ void StackedPanelCollection::MoveAllDraggingPanelsInstantly(
   }
 }
 
+bool StackedPanelCollection::IsMinimized() const {
+  return native_stack_->IsMinimized();
+}
+
 void StackedPanelCollection::UpdatePanelCornerStyle(Panel* panel) {
   panel::CornerStyle corner_style;
   bool at_top = panel == top_panel();

chrome/browser/ui/panels/stacked_panel_collection.h

@@ -65,13 +65,14 @@ class StackedPanelCollection : public PanelCollection {
 
   void MoveAllDraggingPanelsInstantly(const gfx::Vector2d& delta_origin);
 
+  bool IsMinimized() const;
+
   // Returns the maximum available space from the bottom of the stack. The
   // maximum available space is defined as the distance between the bottom
   // of the stack and the bottom of the working area, assuming that all inactive
   // panels are collapsed.
   int GetMaximiumAvailableBottomSpace() const;
 
-  NativePanelStackWindow* native_stack() const { return native_stack_; }
   int num_panels() const { return panels_.size(); }
   const Panels& panels() const { return panels_; }
   Panel* top_panel() const { return panels_.empty() ? NULL : panels_.front(); }

chrome/browser/ui/views/panels/panel_stack_view.cc

@@ -190,10 +190,8 @@ void PanelStackView::UpdateWindowOwnerForTaskbarIconAppearance(Panel* panel) {
 
   HWND stack_window = NULL;
   StackedPanelCollection* stack = panel->stack();
-  if (stack) {
-    stack_window = views::HWNDForWidget(
-        static_cast<PanelStackView*>(stack->native_stack())->window_);
-  }
+  if (stack)
+    stack_window = views::HWNDForWidget(window_);
 
   // The extended style WS_EX_APPWINDOW is used to force a top-level window onto
   // the taskbar. In order for multiple stacked panels to appear as one, this