Get ClientCertStore through ResourceContext.

content/test/webrtc_audio_device_test.cc

Index: content/test/webrtc_audio_device_test.cc
diff --git a/content/test/webrtc_audio_device_test.cc b/content/test/webrtc_audio_device_test.cc
index 605713acda3dd17ae398f597820fb7926b05ed31..fc9e1415080688d2337edda76d9b0c6277cc5588 100644
--- a/content/test/webrtc_audio_device_test.cc
+++ b/content/test/webrtc_audio_device_test.cc
@@ -31,6 +31,7 @@
 #include "content/renderer/renderer_webkitplatformsupport_impl.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_hardware_config.h"
+#include "net/ssl/client_cert_store.h"
 #include "net/url_request/url_request_test_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -173,6 +174,10 @@ class MockRTCResourceContext : public ResourceContext {
     return false;
   }
 
+  virtual scoped_ptr<net::ClientCertStore> GetClientCertStore() OVERRIDE {
+    return scoped_ptr<net::ClientCertStore>();
+  }
+
  private:
   net::URLRequestContext* test_request_context_;