Merging dart:html interfaces and implementations

sdk/lib/html/templates/html/dartium/impl_MouseEvent.darttemplate

Index: sdk/lib/html/templates/html/dartium/impl_MouseEvent.darttemplate
diff --git a/sdk/lib/html/templates/html/interface/interface_MouseEvent.darttemplate b/sdk/lib/html/templates/html/dartium/impl_MouseEvent.darttemplate
similarity index 69%
copy from sdk/lib/html/templates/html/interface/interface_MouseEvent.darttemplate
copy to sdk/lib/html/templates/html/dartium/impl_MouseEvent.darttemplate
index 1ca65f9eda2d9f58e238fed24d6d1a2ff6482243..7be8ca82ba0f070d79e322d9c0838d6790ec3712 100644
--- a/sdk/lib/html/templates/html/interface/interface_MouseEvent.darttemplate
+++ b/sdk/lib/html/templates/html/dartium/impl_MouseEvent.darttemplate
@@ -4,20 +4,16 @@
 
 // WARNING: Do not edit - generated code.
 
-part of html;
-
-$!COMMENT
-abstract class $ID$EXTENDS {
-
-  factory $ID(String type, Window view, int detail, int screenX, int screenY,
-      int clientX, int clientY, int button, [bool canBubble = true,
+class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+  factory $CLASSNAME(String type, Window view, int detail, int screenX,
+      int screenY, int clientX, int clientY, int button, [bool canBubble = true,
       bool cancelable = true, bool ctrlKey = false, bool altKey = false,
       bool shiftKey = false, bool metaKey = false,
       EventTarget relatedTarget = null]) =>
-      _$(ID)FactoryProvider.create$ID(
+      _$(CLASSNAME)FactoryProvider.create$CLASSNAME(
           type, view, detail, screenX, screenY,
           clientX, clientY, button, canBubble, cancelable,
           ctrlKey, altKey, shiftKey, metaKey,
           relatedTarget);
-
-$!MEMBERS}
+$!MEMBERS
+}