Media Remoting Clean-up: Less-redundant naming, style consistency, etc.

media/remoting/sink_availability_observer.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef MEDIA_REMOTING_REMOTING_SINK_OBSERVER_H_
-#define MEDIA_REMOTING_REMOTING_SINK_OBSERVER_H_
+#ifndef MEDIA_REMOTING_SINK_AVAILABILITY_OBSERVER_H_
+#define MEDIA_REMOTING_SINK_AVAILABILITY_OBSERVER_H_
 
 #include "media/mojo/interfaces/remoting.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace media {
+namespace remoting {
 
-// This calss is a pure observer of remoting sink availability to indicate
-// whether a remoting session can be started.
-class RemotingSinkObserver final : public mojom::RemotingSource {
+// Implements the RemotingSource interface for the sole purpose of monitoring
+// sink availability status.
+class SinkAvailabilityObserver final : public mojom::RemotingSource {
  public:
-  RemotingSinkObserver(mojom::RemotingSourceRequest source_request,
-                       mojom::RemoterPtr remoter);
-  ~RemotingSinkObserver() override;
+  SinkAvailabilityObserver(mojom::RemotingSourceRequest source_request,
+                           mojom::RemoterPtr remoter);
+  ~SinkAvailabilityObserver() override;
 
   mojom::RemotingSinkCapabilities sink_capabilities() const {
     return sink_capabilities_;
   }
 
   bool is_remote_decryption_available() const {
     return sink_capabilities_ ==
            mojom::RemotingSinkCapabilities::CONTENT_DECRYPTION_AND_RENDERING;
   }
 
   // RemotingSource implementations.
   void OnSinkAvailable(mojom::RemotingSinkCapabilities capabilities) override;
   void OnSinkGone() override;
   void OnStarted() override {}
   void OnStartFailed(mojom::RemotingStartFailReason reason) override {}
   void OnMessageFromSink(const std::vector<uint8_t>& message) override {}
   void OnStopped(mojom::RemotingStopReason reason) override {}
 
  private:
   const mojo::Binding<mojom::RemotingSource> binding_;
   const mojom::RemoterPtr remoter_;
 
   // When the sink is available, this describes its capabilities. When not
   // available, this is always NONE. Updated by OnSinkAvailable/Gone().
   mojom::RemotingSinkCapabilities sink_capabilities_ =
       mojom::RemotingSinkCapabilities::NONE;
 
-  DISALLOW_COPY_AND_ASSIGN(RemotingSinkObserver);
+  DISALLOW_COPY_AND_ASSIGN(SinkAvailabilityObserver);
 };
 
+}  // namespace remoting
 }  // namespace media
 
-#endif  // MEDIA_REMOTING_REMOTING_SINK_OBSERVER_H_
+#endif  // MEDIA_REMOTING_SINK_AVAILABILITY_OBSERVER_H_