WidgetDelegateView is its own contents view.

mash/example/window_type_launcher/window_type_launcher.cc

Index: mash/example/window_type_launcher/window_type_launcher.cc
diff --git a/mash/example/window_type_launcher/window_type_launcher.cc b/mash/example/window_type_launcher/window_type_launcher.cc
index 0ec6d5b06d3f194227eb19c8fe011d408e7b90a9..117b6eb6c8acea6d01db7077d90b1d7df9ce06a1 100644
--- a/mash/example/window_type_launcher/window_type_launcher.cc
+++ b/mash/example/window_type_launcher/window_type_launcher.cc
@@ -89,7 +89,6 @@ class WindowDelegateView : public views::WidgetDelegateView {
     return base::ASCIIToUTF16("Window");
   }
   gfx::Size GetPreferredSize() const override { return gfx::Size(300, 300); }
-  View* GetContentsView() override { return this; }
 
  private:
   const uint32_t traits_;
@@ -130,7 +129,6 @@ class ModalWindow : public views::WidgetDelegateView,
   }
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   bool CanResize() const override { return true; }
   base::string16 GetWindowTitle() const override {
     return base::ASCIIToUTF16("Modal Window");
@@ -188,7 +186,6 @@ class NonModalTransient : public views::WidgetDelegateView {
   gfx::Size GetPreferredSize() const override { return gfx::Size(250, 250); }
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   bool CanResize() const override { return true; }
   base::string16 GetWindowTitle() const override {
     return base::ASCIIToUTF16("Non-Modal Transient");
@@ -346,7 +343,6 @@ class WindowTypeLauncherView : public views::WidgetDelegateView,
   }
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this;  }
   bool CanResize() const override { return true;  }
   base::string16 GetWindowTitle() const override {
     return base::ASCIIToUTF16("Examples: Window Builder");