media: Make MediaKeys ref-counted.

media/base/cdm_initialized_promise.cc

Index: media/base/cdm_initialized_promise.cc
diff --git a/media/base/cdm_initialized_promise.cc b/media/base/cdm_initialized_promise.cc
index dcc9c79c830c865c5efc974052becce6e0abcf04..d15d514ed3acceec70130385dc610f88b96e94ce 100644
--- a/media/base/cdm_initialized_promise.cc
+++ b/media/base/cdm_initialized_promise.cc
@@ -6,17 +6,17 @@
 
 namespace media {
 
-CdmInitializedPromise::CdmInitializedPromise(const CdmCreatedCB& cdm_created_cb,
-                                             scoped_ptr<MediaKeys> cdm)
-    : cdm_created_cb_(cdm_created_cb), cdm_(cdm.Pass()) {
-}
+CdmInitializedPromise::CdmInitializedPromise(
+    const CdmCreatedCB& cdm_created_cb,
+    const scoped_refptr<MediaKeys>& cdm)
+    : cdm_created_cb_(cdm_created_cb), cdm_(cdm) {}
 
 CdmInitializedPromise::~CdmInitializedPromise() {
 }
 
 void CdmInitializedPromise::resolve() {
   MarkPromiseSettled();
-  cdm_created_cb_.Run(cdm_.Pass(), "");
+  cdm_created_cb_.Run(cdm_, "");
 }
 
 void CdmInitializedPromise::reject(MediaKeys::Exception exception_code,