Remove old webui History page on desktop and mobile

chrome/browser/ui/webui/uber/uber_ui.h

Index: chrome/browser/ui/webui/uber/uber_ui.h
diff --git a/chrome/browser/ui/webui/uber/uber_ui.h b/chrome/browser/ui/webui/uber/uber_ui.h
index f041585169565b32e5f98ad5cf577e99431e59c4..865d2d01eb3052d1b7753878b426ad527d38c02c 100644
--- a/chrome/browser/ui/webui/uber/uber_ui.h
+++ b/chrome/browser/ui/webui/uber/uber_ui.h
@@ -8,19 +8,9 @@
 #include <string>
 
 #include "base/macros.h"
-#include "base/scoped_observer.h"
 #include "base/values.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_ui_controller.h"
-#include "extensions/browser/extension_registry_observer.h"
-
-namespace content {
-class BrowserContext;
-}
-
-namespace extensions {
-class ExtensionRegistry;
-}
 
 // Logs visits to subframe URLs (e.g. chrome://settings-frame).
 class SubframeLogger : public content::WebContentsObserver {
@@ -67,25 +57,11 @@ class UberUI : public content::WebUIController {
   DISALLOW_COPY_AND_ASSIGN(UberUI);
 };
 
-class UberFrameUI : public content::WebUIController,
-                    public extensions::ExtensionRegistryObserver {
+class UberFrameUI : public content::WebUIController {
  public:
   explicit UberFrameUI(content::WebUI* web_ui);
   ~UberFrameUI() override;
 
- private:
-  // extensions::ExtensionRegistryObserver implementation.
-  void OnExtensionLoaded(content::BrowserContext* browser_context,
-                         const extensions::Extension* extension) override;
-  void OnExtensionUnloaded(
-      content::BrowserContext* browser_context,
-      const extensions::Extension* extension,
-      extensions::UnloadedExtensionInfo::Reason reason) override;
-
-  ScopedObserver<extensions::ExtensionRegistry,
-                 extensions::ExtensionRegistryObserver>
-      extension_registry_observer_;
-
   DISALLOW_COPY_AND_ASSIGN(UberFrameUI);
 };