Optimize dartium dart:html bindings so real world application performance is acceptable. Improves d…

tools/dom/scripts/systemhtml.py

Index: tools/dom/scripts/systemhtml.py
diff --git a/tools/dom/scripts/systemhtml.py b/tools/dom/scripts/systemhtml.py
index 672d97e7a1faaed2eda62a1fd0b2b10ea104d85f..7d997eed2370e587bcae9dba57e1385bf4c7d783 100644
--- a/tools/dom/scripts/systemhtml.py
+++ b/tools/dom/scripts/systemhtml.py
@@ -586,7 +586,7 @@ class HtmlDartInterfaceGenerator(object):
         class_modifiers = ''
       else:
         # For Dartium w/ JsInterop these suppressed interfaces are needed to
-        # instanciate the internal classes when wrap_jso is called for a JS object.
+        # instanciate the internal classes.
         if (self._renamer.ShouldSuppressInterface(self._interface) and
             not(isinstance(self._backend, Dart2JSBackend)) and
             self._options.dart_js_interop):
@@ -600,13 +600,6 @@ class HtmlDartInterfaceGenerator(object):
 
     class_name = self._interface_type_info.implementation_name()
 
-    js_interop_equivalence_op = \
-      '  bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);\n' \
-      + '  int get hashCode => unwrap_jso(this).hashCode;\n'
-    # ClientRect overrides the equivalence operator.
-    if interface_name == 'ClientRect' or interface_name == 'DomRectReadOnly':
-        js_interop_equivalence_op = ''
-
     js_interop_wrapper = '''
 
   @Deprecated("Internal Use Only")
@@ -633,8 +626,7 @@ class HtmlDartInterfaceGenerator(object):
 
   @Deprecated("Internal Use Only")
   {0}.internal_() {{ }}
-
-{1}'''.format(class_name, js_interop_equivalence_op)
+'''.format(class_name)
         # Change to use the synthesized class so we can construct with a mixin
         # classes prefixed with name of NativeFieldWrapperClass2 don't have a
         # default constructor so classes with mixins can't be new'd.