Some more refactorings of overload dispatcher generation.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 66a501427367b8ac2d10028bb755ba41faf862d1..87d0978270b7696bc6fa756078c655f2e0998847 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -1606,6 +1606,7 @@ class CanvasRenderingContext2D extends CanvasRenderingContext {
       return;
     }
     _fillText_2(text, x, y);
+    return;
   }
 
   @DocsEditable
@@ -1702,6 +1703,7 @@ class CanvasRenderingContext2D extends CanvasRenderingContext {
       return;
     }
     _strokeRect_2(x, y, width, height);
+    return;
   }
 
   @DocsEditable
@@ -1718,6 +1720,7 @@ class CanvasRenderingContext2D extends CanvasRenderingContext {
       return;
     }
     _strokeText_2(text, x, y);
+    return;
   }
 
   @DocsEditable
@@ -6487,6 +6490,7 @@ class DataView extends ArrayBufferView {
       return;
     }
     _setFloat32_2(byteOffset, value);
+    return;
   }
 
   @DocsEditable
@@ -6503,6 +6507,7 @@ class DataView extends ArrayBufferView {
       return;
     }
     _setFloat64_2(byteOffset, value);
+    return;
   }
 
   @DocsEditable
@@ -6519,6 +6524,7 @@ class DataView extends ArrayBufferView {
       return;
     }
     _setInt16_2(byteOffset, value);
+    return;
   }
 
   @DocsEditable
@@ -6535,6 +6541,7 @@ class DataView extends ArrayBufferView {
       return;
     }
     _setInt32_2(byteOffset, value);
+    return;
   }
 
   @DocsEditable
@@ -6555,6 +6562,7 @@ class DataView extends ArrayBufferView {
       return;
     }
     _setUint16_2(byteOffset, value);
+    return;
   }
 
   @DocsEditable
@@ -6571,6 +6579,7 @@ class DataView extends ArrayBufferView {
       return;
     }
     _setUint32_2(byteOffset, value);
+    return;
   }
 
   @DocsEditable
@@ -9866,6 +9875,7 @@ abstract class Element extends Node implements ElementTraversal {
       return;
     }
     _scrollIntoViewIfNeeded_2();
+    return;
   }
 
   @DocsEditable
@@ -10542,6 +10552,7 @@ class Entry extends NativeFieldWrapperClass1 {
       return;
     }
     _copyTo_2(parent);
+    return;
   }
 
   @DocsEditable
@@ -10566,6 +10577,7 @@ class Entry extends NativeFieldWrapperClass1 {
       return;
     }
     _moveTo_2(parent);
+    return;
   }
 
   @DocsEditable
@@ -11572,6 +11584,7 @@ class FileReader extends EventTarget {
       return;
     }
     _readAsText_2(blob);
+    return;
   }
 
   @DocsEditable
@@ -14352,6 +14365,7 @@ class InputElement extends _Element_Merged implements
       return;
     }
     _stepDown_2();
+    return;
   }
 
   @DocsEditable
@@ -14368,6 +14382,7 @@ class InputElement extends _Element_Merged implements
       return;
     }
     _stepUp_2();
+    return;
   }
 
   @DocsEditable
@@ -16624,6 +16639,7 @@ class MediaElement extends _Element_Merged {
       return;
     }
     _webkitAddKey_2(keySystem, key);
+    return;
   }
 
   @DocsEditable
@@ -16644,6 +16660,7 @@ class MediaElement extends _Element_Merged {
       return;
     }
     _webkitGenerateKeyRequest_2(keySystem);
+    return;
   }
 
   @DocsEditable
@@ -21984,6 +22001,7 @@ class SpeechGrammarList extends NativeFieldWrapperClass1 implements List<SpeechG
       return;
     }
     _addFromString_2(string);
+    return;
   }
 
   @DocsEditable
@@ -22000,6 +22018,7 @@ class SpeechGrammarList extends NativeFieldWrapperClass1 implements List<SpeechG
       return;
     }
     _addFromUri_2(src);
+    return;
   }
 
   @DocsEditable
@@ -23451,6 +23470,7 @@ class TextAreaElement extends _Element_Merged {
       return;
     }
     _setSelectionRange_2(start, end);
+    return;
   }
 
   @DocsEditable
@@ -27628,6 +27648,7 @@ class WebSocket extends EventTarget {
       return;
     }
     _close_3();
+    return;
   }
 
   @DocsEditable