Enable audio/video tag in content_shell

content/shell/shell_resource_context.h

Index: content/shell/shell_resource_context.h
diff --git a/content/shell/shell_resource_context.h b/content/shell/shell_resource_context.h
index f01a120ca38da26ee31bc2dad4ab53a7391c54e5..a6fe2b60408cefc891ce0ab93b0f33dafe058d54 100644
--- a/content/shell/shell_resource_context.h
+++ b/content/shell/shell_resource_context.h
@@ -9,6 +9,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/resource_context.h"
+#include "media/audio/audio_manager.h"
 
 class ChromeBlobStorageContext;
 
@@ -20,7 +21,8 @@ class ShellResourceContext : public content::ResourceContext {
  public:
   ShellResourceContext(
       ShellURLRequestContextGetter* getter,
-      ChromeBlobStorageContext* blob_storage_context);
+      ChromeBlobStorageContext* blob_storage_context,
+      AudioManager* audio_manager);
   virtual ~ShellResourceContext();
 
  private:
@@ -30,6 +32,7 @@ class ShellResourceContext : public content::ResourceContext {
 
   scoped_refptr<ShellURLRequestContextGetter> getter_;
   scoped_refptr<ChromeBlobStorageContext> blob_storage_context_;
+  scoped_refptr<AudioManager> audio_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellResourceContext);
 };