Introduce the ENABLE_BROWSER_CDMS macro.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 35e046a619bd497c93305c792a39bd29cb011313..22b439f652692492f88f744fe111cc5863f3b07d 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -70,10 +70,13 @@ class RenderWidgetFullscreenPepper;
 struct CustomContextMenuContext;
 
 #if defined(OS_ANDROID)
-class RendererCdmManager;
 class RendererMediaPlayerManager;
 #endif
 
+#if defined(ENABLE_BROWSER_CDMS)
+class RendererCdmManager;
+#endif
+
 class CONTENT_EXPORT RenderFrameImpl
     : public RenderFrame,
       NON_EXPORTED_BASE(public blink::WebFrameClient),
@@ -541,6 +544,9 @@ class CONTENT_EXPORT RenderFrameImpl
       blink::WebMediaPlayerClient* client);
 
   RendererMediaPlayerManager* GetMediaPlayerManager();
+#endif
+
+#if defined(ENABLE_BROWSER_CDMS)
   RendererCdmManager* GetCdmManager();
 #endif
 
@@ -610,10 +616,16 @@ class CONTENT_EXPORT RenderFrameImpl
   blink::WebUserMediaClient* web_user_media_client_;
 
 #if defined(OS_ANDROID)
-  // These manage all media players and CDMs in this render frame for
-  // communicating with the real media player and CDM objects in the browser
-  // process. It's okay to use raw pointers since they are RenderFrameObservers.
+  // These manage all media players in this render frame for communicating with
+  // the real media player in the browser process. It's okay to use a raw
+  // pointer since it's a RenderFrameObserver.
   RendererMediaPlayerManager* media_player_manager_;
+#endif
+
+#if defined(ENABLE_BROWSER_CDMS)
+  // These manage all CDMs in this render frame for communicating with the real
+  // CDM in the browser process. It's okay to use a raw pointer since it's a
+  // RenderFrameObserver.
   RendererCdmManager* cdm_manager_;
 #endif