Convert utility process ParseMediaMetadata blob reading IPC to mojo

chrome/utility/extensions/extensions_handler.h

Index: chrome/utility/extensions/extensions_handler.h
diff --git a/chrome/utility/extensions/extensions_handler.h b/chrome/utility/extensions/extensions_handler.h
index e4d5d1ea6db2f38a0c8c5a055a3c3a131755d137..bdeb3592f338bdafbe92e662cb0f9a2f46e6159e 100644
--- a/chrome/utility/extensions/extensions_handler.h
+++ b/chrome/utility/extensions/extensions_handler.h
@@ -20,8 +20,6 @@
 #error "Extensions must be enabled"
 #endif
 
-class ChromeContentUtilityClient;
-
 namespace service_manager {
 class InterfaceRegistry;
 }
@@ -40,7 +38,6 @@ class ExtensionsHandler : public UtilityMessageHandler {
   // interface.
   static void ExposeInterfacesToBrowser(
       service_manager::InterfaceRegistry* registry,
-      ChromeContentUtilityClient* utility_client,
       bool running_elevated);
 
   // UtilityMessageHandler: