media: Remove Browser CDM implementation

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 58b4b93db25272585d5e2326ddbad736044d9f4a..b5904b226ef97ff5fef68b2a10a4ea16a8f1bea8 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -1190,13 +1190,6 @@ class CONTENT_EXPORT RenderFrameImpl
   // process. Always use the GetRemoterFactory() accessor instead of this.
   media::mojom::RemoterFactoryPtr remoter_factory_;
 
-#if defined(ENABLE_BROWSER_CDMS)
-  // 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
-
   // The CDM and decoder factory attached to this frame, lazily initialized.
   std::unique_ptr<media::CdmFactory> cdm_factory_;
   std::unique_ptr<media::DecoderFactory> decoder_factory_;