Add mojo::StrongBindingSet and use it in GeolocationServiceContext.

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 7aa79eefc542720c2b9e04e982dd5930607d2fee..3f7624661b2b3d0bcf2d34933ecaab93bfabfb90 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -364,10 +364,15 @@ jint ContentViewCoreImpl::GetBackgroundColor(JNIEnv* env, jobject obj) {
 }
 
 void ContentViewCoreImpl::PauseOrResumeGeolocation(bool should_pause) {
-  if (should_pause)
-    web_contents_->GetGeolocationServiceContext()->PauseUpdates();
-  else
-    web_contents_->GetGeolocationServiceContext()->ResumeUpdates();
+  if (should_pause) {
+    GeolocationServiceContext::GetOrCreateForWebContents(web_contents_)
+        ->PauseUpdates();
+  } else {
+    GeolocationServiceContext* geolocation_service_context =
+        GeolocationServiceContext::FromWebContents(web_contents_);
+    if (geolocation_service_context)
+      geolocation_service_context->ResumeUpdates();
+  }
 }
 
 // All positions and sizes are in CSS pixels.