First try at removing ? from HTML.

tools/dom/templates/html/impl/impl_AudioContext.darttemplate

Index: tools/dom/templates/html/impl/impl_AudioContext.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_AudioContext.darttemplate b/tools/dom/templates/html/impl/impl_AudioContext.darttemplate
index 1ef4069fa5e4d011dc663061865ca1317b1f26fb..9100aba078d63a5e7de27b6ccbff08055729b96f 100644
--- a/tools/dom/templates/html/impl/impl_AudioContext.darttemplate
+++ b/tools/dom/templates/html/impl/impl_AudioContext.darttemplate
@@ -22,10 +22,10 @@ $if DART2JS
       [int numberOfInputChannels, int numberOfOutputChannels]) {
     var function = JS('dynamic', '#.createScriptProcessor || '
         '#.createJavaScriptNode', this, this);
-    if (?numberOfOutputChannels) {
+    if (numberOfOutputChannels != null) {
       return JS('ScriptProcessorNode', '#.call(#, #, #, #)', function, this,
           bufferSize, numberOfInputChannels, numberOfOutputChannels);
-    } else if (?numberOfInputChannels) {
+    } else if (numberOfInputChannels != null) {
       return JS('ScriptProcessorNode', '#.call(#, #, #)', function, this,
           bufferSize, numberOfInputChannels);
     } else {