Specify the base namespace of ::mojom in user_media_client_impl_unittest.cc.

content/renderer/media/user_media_client_impl_unittest.cc

Index: content/renderer/media/user_media_client_impl_unittest.cc
diff --git a/content/renderer/media/user_media_client_impl_unittest.cc b/content/renderer/media/user_media_client_impl_unittest.cc
index 99e11b1188ee14088ef5534cd63bd9024f04e742..3eccbce873c01598adc8bc63ebea37bed3a3afd5 100644
--- a/content/renderer/media/user_media_client_impl_unittest.cc
+++ b/content/renderer/media/user_media_client_impl_unittest.cc
@@ -76,12 +76,12 @@ class MockMediaDevicesDispatcherHost
     callback.Run(result);
   }
 
-  mojom::MediaDevicesDispatcherHostPtr CreateInterfacePtrAndBind() {
+  ::mojom::MediaDevicesDispatcherHostPtr CreateInterfacePtrAndBind() {
     return binding_.CreateInterfacePtrAndBind();
   }
 
  private:
-  mojo::Binding<mojom::MediaDevicesDispatcherHost> binding_;
+  mojo::Binding<::mojom::MediaDevicesDispatcherHost> binding_;
 };
 
 class UserMediaClientImplUnderTest : public UserMediaClientImpl {