Resume playback of EME stream only on SessionKeysChange event.

content/renderer/media/crypto/ppapi_decryptor.h

Index: content/renderer/media/crypto/ppapi_decryptor.h
diff --git a/content/renderer/media/crypto/ppapi_decryptor.h b/content/renderer/media/crypto/ppapi_decryptor.h
index 0c4c0ddc4634fc841cab8c0bfeb93dec2a1cde5f..39c38c210f3b176a355192a775f1c61b8117fb02 100644
--- a/content/renderer/media/crypto/ppapi_decryptor.h
+++ b/content/renderer/media/crypto/ppapi_decryptor.h
@@ -116,8 +116,7 @@ class PpapiDecryptor : public media::MediaKeys, public media::Decryptor {
                       uint32 system_code,
                       const std::string& error_description);
 
-  // On a successful Update() or SessionReady event, trigger playback to resume.
-  void ResumePlayback();
+  void AttemptToResumePlayback();
 
   // Callback to notify that a fatal error happened in |plugin_cdm_delegate_|.
   // The error is terminal and |plugin_cdm_delegate_| should not be used after