Revert of mandoline: Add back/forward support and UI.

components/web_view/web_view_impl.h

Index: components/web_view/web_view_impl.h
diff --git a/components/web_view/web_view_impl.h b/components/web_view/web_view_impl.h
index 3c6301c19192307e5f1c347d399c8ab869bc675c..c10a7bef87877f894c0704eabfe54bb89584b6ab 100644
--- a/components/web_view/web_view_impl.h
+++ b/components/web_view/web_view_impl.h
@@ -7,7 +7,6 @@
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/memory/scoped_vector.h"
 #include "components/view_manager/public/cpp/view_observer.h"
 #include "components/view_manager/public/cpp/view_tree_delegate.h"
 #include "components/web_view/frame_devtools_agent_delegate.h"
@@ -22,11 +21,10 @@
 namespace web_view {
 
 class Frame;
+class FrameTree;
 class FrameDevToolsAgent;
-class FrameTree;
 class HTMLMessageEvent;
 class PendingWebViewLoad;
-class URLRequestCloneable;
 
 class WebViewImpl : public mojom::WebView,
                     public mojo::ViewTreeDelegate,
@@ -45,18 +43,11 @@
   // See description above |pending_load_| for details.
   void OnLoad();
 
-  // Actually performs the load and tells our delegate the state of the
-  // forward/back list is. This is the shared implementation between
-  // LoadRequest() and Go{Back,Forward}().
-  void LoadRequestImpl(mojo::URLRequestPtr request);
-
   // Overridden from WebView:
   void LoadRequest(mojo::URLRequestPtr request) override;
   void GetViewTreeClient(
       mojo::InterfaceRequest<mojo::ViewTreeClient> view_tree_client)
           override;
-  void GoBack() override;
-  void GoForward() override;
 
   // Overridden from mojo::ViewTreeDelegate:
   void OnEmbed(mojo::View* root) override;
@@ -98,15 +89,6 @@
 
   scoped_ptr<FrameDevToolsAgent> devtools_agent_;
 
-  // It would be nice if mojo::URLRequest were cloneable; however, its use of
-  // ScopedDataPipieConsumerHandle means that it isn't.
-  ScopedVector<URLRequestCloneable> back_list_;
-  ScopedVector<URLRequestCloneable> forward_list_;
-
-  // The request which is either currently loading or completed. Added to
-  // |back_list_| or |forward_list_| on further navigation.
-  scoped_ptr<URLRequestCloneable> current_page_request_;
-
   DISALLOW_COPY_AND_ASSIGN(WebViewImpl);
 };