Add mojo::StrongBindingSet and use it in GeolocationServiceContext.

content/browser/geolocation/geolocation_service_context.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_SERVICE_CONTEXT_H_
 #define CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_SERVICE_CONTEXT_H_
 
-#include "base/memory/scoped_vector.h"
 #include "content/browser/geolocation/geolocation_service_impl.h"
+#include "content/common/geolocation_service.mojom.h"
+#include "content/public/browser/web_contents_user_data.h"
+#include "mojo/common/strong_binding_set.h"
 
 namespace content {
+struct Geoposition;
 
 // Provides information to a set of GeolocationServiceImpl instances that are
 // associated with a given context. Notably, allows pausing and resuming
 // geolocation on these instances.
-class GeolocationServiceContext {
+class GeolocationServiceContext
+    : public WebContentsUserData<GeolocationServiceContext> {
  public:
-  GeolocationServiceContext();
-  virtual ~GeolocationServiceContext();
+  static GeolocationServiceContext* GetOrCreateForWebContents(
+      WebContents* web_contents);
 
-  // Creates a GeolocationServiceImpl that is weakly bound to |request|.
-  // |update_callback| will be called when services send
-  // location updates to their clients.
-  void CreateService(const base::Closure& update_callback,
-                     mojo::InterfaceRequest<GeolocationService> request);
-
-  // Called when a service has a connection error. After this call, it is no
-  // longer safe to access |service|.
-  void ServiceHadConnectionError(GeolocationServiceImpl* service);
+  // Creates a GeolocationServiceImpl that is bound to |request|.
+  static void CreateService(RenderFrameHost* render_frame_host,
+                            mojo::InterfaceRequest<GeolocationService> request);
 
   // Pauses and resumes geolocation. Resuming when nothing is paused is a
   // no-op. If a service is added while geolocation is paused, that service
   // will not get geolocation updates until geolocation is resumed.
   void PauseUpdates();
   void ResumeUpdates();
 
   // Returns whether geolocation updates are currently paused.
-  bool paused() { return paused_; }
+  bool paused() const { return paused_; }
+
+  // Returns the current position override, or nullptr if there isn't one.
+  const Geoposition* position_override() const {
+    return geoposition_override_.get();
+  }
+
+  void DestroyService(GeolocationServiceImpl* service);
 
   // Enables geolocation override. This method can be used to trigger possible
   // location-specific behavior in a particular context.
   void SetOverride(scoped_ptr<Geoposition> geoposition);
 
   // Disables geolocation override.
   void ClearOverride();
 
  private:
-  ScopedVector<GeolocationServiceImpl> services_;
+  friend class WebContentsUserData<GeolocationServiceContext>;
+
+  explicit GeolocationServiceContext(WebContents* web_contents);
+  ~GeolocationServiceContext() override;
+
+  void CreateServiceImpl(RenderFrameHost* render_frame_host,
+                         mojo::InterfaceRequest<GeolocationService> request);
+
+  mojo::StrongBindingSet<GeolocationServiceImpl> services_;
   bool paused_;
 
   scoped_ptr<Geoposition> geoposition_override_;
 
   DISALLOW_COPY_AND_ASSIGN(GeolocationServiceContext);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_SERVICE_CONTEXT_H_