Correct confusing error message from OfflineAudioContext.suspend()

third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.h

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 31 matching lines @@
   static OfflineAudioContext* create(ExecutionContext*,
                                      unsigned numberOfChannels,
                                      unsigned numberOfFrames,
                                      float sampleRate,
                                      ExceptionState&);
 
   ~OfflineAudioContext() override;
 
   DECLARE_VIRTUAL_TRACE();
 
-  unsigned length() const { return m_totalRenderFrames; }
+  size_t length() const { return m_totalRenderFrames; }
 
   ScriptPromise startOfflineRendering(ScriptState*);
 
   ScriptPromise suspendContext(ScriptState*, double);
   ScriptPromise resumeContext(ScriptState*) final;
 
   // This is to implement the pure virtual method from BaseAudioContext.
   // CANNOT be called from an OfflineAudioContext.
   ScriptPromise suspendContext(ScriptState*) final;
 
@@ skipping 62 matching lines @@
   // state when the context is suspended.
   bool m_isRenderingStarted;
 
   // Total render sample length.
   size_t m_totalRenderFrames;
 };
 
 }  // namespace blink
 
 #endif  // OfflineAudioContext_h