Add mojo::StrongBindingSet and use it in GeolocationServiceContext.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index fdd38e2540374d9c049cd2b5289c77cfacd2dc6a..bbb5cd1b6b362f444ffaf2904964f82b8b316753 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -41,7 +41,6 @@
 #include "content/browser/frame_host/navigator_impl.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
-#include "content/browser/geolocation/geolocation_service_context.h"
 #include "content/browser/host_zoom_map_impl.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/manifest/manifest_manager_host.h"
@@ -397,7 +396,6 @@ WebContentsImpl::WebContentsImpl(BrowserContext* browser_context)
       is_subframe_(false),
       force_disable_overscroll_content_(false),
       last_dialog_suppressed_(false),
-      geolocation_service_context_(new GeolocationServiceContext()),
       accessibility_mode_(
           BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode()),
       audio_stream_monitor_(this),
@@ -2106,10 +2104,6 @@ RenderFrameHost* WebContentsImpl::GetGuestByInstanceID(
   return guest->GetMainFrame();
 }
 
-GeolocationServiceContext* WebContentsImpl::GetGeolocationServiceContext() {
-  return geolocation_service_context_.get();
-}
-
 WakeLockServiceContext* WebContentsImpl::GetWakeLockServiceContext() {
   return wake_lock_service_context_.get();
 }