Use nullptr instead of 0 in WebAudio

Source/modules/webaudio/ScriptProcessorNode.cpp

Index: Source/modules/webaudio/ScriptProcessorNode.cpp
diff --git a/Source/modules/webaudio/ScriptProcessorNode.cpp b/Source/modules/webaudio/ScriptProcessorNode.cpp
index d425ae890aafa46f398205c386ede83dc41883f6..73d57115bafcfc6df97c55d82107c37684ded1e0 100644
--- a/Source/modules/webaudio/ScriptProcessorNode.cpp
+++ b/Source/modules/webaudio/ScriptProcessorNode.cpp
@@ -73,17 +73,17 @@ ScriptProcessorNode* ScriptProcessorNode::create(AudioContext* context, float sa
     case 16384:
         break;
     default:
-        return 0;
+        return nullptr;
     }
 
     if (!numberOfInputChannels && !numberOfOutputChannels)
-        return 0;
+        return nullptr;
 
     if (numberOfInputChannels > AudioContext::maxNumberOfChannels())
-        return 0;
+        return nullptr;
 
     if (numberOfOutputChannels > AudioContext::maxNumberOfChannels())
-        return 0;
+        return nullptr;
 
     return new ScriptProcessorNode(context, sampleRate, bufferSize, numberOfInputChannels, numberOfOutputChannels);
 }