Add MediaKeys::GetCdmId().

content/renderer/media/crypto/proxy_media_keys.h

Index: content/renderer/media/crypto/proxy_media_keys.h
diff --git a/content/renderer/media/crypto/proxy_media_keys.h b/content/renderer/media/crypto/proxy_media_keys.h
index bb08a5f7aaba31bc16728f342de691daf22271c5..6b4df648276dede03a675053766b5851502b414a 100644
--- a/content/renderer/media/crypto/proxy_media_keys.h
+++ b/content/renderer/media/crypto/proxy_media_keys.h
@@ -64,6 +64,7 @@ class ProxyMediaKeys : public media::MediaKeys {
   virtual void GetUsableKeyIds(
       const std::string& web_session_id,
       scoped_ptr<media::KeyIdsPromise> promise) override;
+  virtual int GetCdmId() const override;
 
   // Callbacks.
   void OnSessionCreated(uint32 session_id, const std::string& web_session_id);
@@ -76,8 +77,6 @@ class ProxyMediaKeys : public media::MediaKeys {
                       media::MediaKeys::KeyError error_code,
                       uint32 system_code);
 
-  int GetCdmId() const;
-
  private:
   // The Android-specific code that handles sessions uses integer session ids
   // (basically a reference id), but media::MediaKeys bases everything on