Componentize EncryptedMediaMessageFilter and rename it CdmMessageFilter.

components/cdm/common/cdm_message_generator.cc

Index: components/cdm/common/cdm_message_generator.cc
diff --git a/extensions/common/extension_message_generator.cc b/components/cdm/common/cdm_message_generator.cc
similarity index 66%
copy from extensions/common/extension_message_generator.cc
copy to components/cdm/common/cdm_message_generator.cc
index b066c4f6cb8c9952481f95faf982f405e0a48d4a..2aabce727a5b72c028f5f1246a63679088ca4b19 100644
--- a/extensions/common/extension_message_generator.cc
+++ b/components/cdm/common/cdm_message_generator.cc
@@ -4,31 +4,31 @@
 
 // Get basic type definitions.
 #define IPC_MESSAGE_IMPL
-#include "extensions/common/extension_message_generator.h"
+#include "components/cdm/common/cdm_message_generator.h"
 
 // Generate constructors.
 #include "ipc/struct_constructor_macros.h"
-#include "extensions/common/extension_message_generator.h"
+#include "components/cdm/common/cdm_message_generator.h"
 
 // Generate destructors.
 #include "ipc/struct_destructor_macros.h"
-#include "extensions/common/extension_message_generator.h"
+#include "components/cdm/common/cdm_message_generator.h"
 
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
 namespace IPC {
-#include "extensions/common/extension_message_generator.h"
+#include "components/cdm/common/cdm_message_generator.h"
 }  // namespace IPC
 
 // Generate param traits read methods.
 #include "ipc/param_traits_read_macros.h"
 namespace IPC {
-#include "extensions/common/extension_message_generator.h"
+#include "components/cdm/common/cdm_message_generator.h"
 }  // namespace IPC
 
 // Generate param traits log methods.
 #include "ipc/param_traits_log_macros.h"
 namespace IPC {
-#include "extensions/common/extension_message_generator.h"
+#include "components/cdm/common/cdm_message_generator.h"
 }  // namespace IPC