Bug 1265400 - Use unsigned long for AudioBuffer length and numberOfChannels; r=smaug

MozReview-Commit-ID: 47ZDDvj5QrA

--HG--
extra : rebase_source : 2c441c7d04ec84eeec526a9a93607ffcac263617

dom/media/webaudio/AudioBuffer.h

@@ -70,7 +70,7 @@ public:
     return mSampleRate;
   }
 
-  int32_t Length() const
+  uint32_t Length() const
   {
     return mLength;
   }

dom/webidl/AudioBuffer.webidl

@@ -13,12 +13,12 @@
 interface AudioBuffer {
 
     readonly attribute float sampleRate;
-    readonly attribute long length;
+    readonly attribute unsigned long length;
 
     // in seconds 
     readonly attribute double duration;
 
-    readonly attribute long numberOfChannels;
+    readonly attribute unsigned long numberOfChannels;
 
     [Throws]
     Float32Array getChannelData(unsigned long channel);