Move MediaKeys::Exception to CdmPromise::Exception

media/base/cdm_initialized_promise.h

Index: media/base/cdm_initialized_promise.h
diff --git a/media/base/cdm_initialized_promise.h b/media/base/cdm_initialized_promise.h
index cc11f31d96cc2b19c6287cbf8280635ba3db9d59..8e48f7cd0fa2b422ff1f54fcb0c831bf4869bfbb 100644
--- a/media/base/cdm_initialized_promise.h
+++ b/media/base/cdm_initialized_promise.h
@@ -11,10 +11,11 @@
 #include "media/base/cdm_factory.h"
 #include "media/base/cdm_promise.h"
 #include "media/base/media_export.h"
-#include "media/base/media_keys.h"
 
 namespace media {
 
+class MediaKeys;
+
 // Promise to be resolved when the CDM is initialized. It owns the MediaKeys
 // object until the initialization completes, which it then passes to
 // |cdm_created_cb|.
@@ -26,7 +27,7 @@ class MEDIA_EXPORT CdmInitializedPromise : public SimpleCdmPromise {
 
   // SimpleCdmPromise implementation.
   void resolve() override;
-  void reject(MediaKeys::Exception exception_code,
+  void reject(CdmPromise::Exception exception_code,
               uint32_t system_code,
               const std::string& error_message) override;