Remove PeerConnectionIdentityStore and related messaging/storage code.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 386669453eab8e6116f21febd37803c10342a676..0fe7f12245f263d66ca69512ec13f52af582b5e8 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -121,7 +121,6 @@ class RendererGpuVideoAcceleratorFactories;
 class ResourceDispatchThrottler;
 class V8SamplingProfiler;
 class VideoCaptureImplManager;
-class WebRTCIdentityService;
 
 #if defined(OS_ANDROID)
 class StreamTextureFactory;
@@ -370,12 +369,6 @@ class CONTENT_EXPORT RenderThreadImpl
                               const base::string16& str);
 #endif
 
-#if defined(ENABLE_WEBRTC)
-  WebRTCIdentityService* get_webrtc_identity_service() {
-    return webrtc_identity_service_.get();
-  }
-#endif
-
   // For producing custom V8 histograms. Custom histograms are produced if all
   // RenderViews share the same host, and the host is in the pre-specified set
   // of hosts we want to produce custom diagrams for. The name for a custom
@@ -646,10 +639,6 @@ class CONTENT_EXPORT RenderThreadImpl
 
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
-#if defined(ENABLE_WEBRTC)
-  std::unique_ptr<WebRTCIdentityService> webrtc_identity_service_;
-#endif
-
   std::unique_ptr<MemoryObserver> memory_observer_;
 
   scoped_refptr<base::SingleThreadTaskRunner>