media: Remove BrowserCdmFactory inferface.

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index 8f92ff3fabacd152d8a9531ad524f1f139266dd2..3be2a8f1c1ff39e8eb4f7cf5dbf0241545888c48 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -7,6 +7,7 @@
 #include "base/files/file_path.h"
 #include "content/public/browser/client_certificate_delegate.h"
 #include "content/public/common/sandbox_type.h"
+#include "media/base/cdm_factory.h"
 #include "storage/browser/quota/quota_manager.h"
 #include "ui/gfx/image/image_skia.h"
 #include "url/gurl.h"
@@ -113,6 +114,10 @@ bool ContentBrowserClient::ShouldSwapBrowsingInstancesForNavigation(
   return false;
 }
 
+scoped_ptr<media::CdmFactory> ContentBrowserClient::CreateCdmFactory() {
+  return nullptr;
+}
+
 bool ContentBrowserClient::ShouldSwapProcessesForRedirect(
     ResourceContext* resource_context, const GURL& current_url,
     const GURL& new_url) {