Remove support for Javascript warnings in the VM.

runtime/lib/identical.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/object.h"
 #include "vm/report.h"
 
 namespace dart {
 
-DECLARE_FLAG(bool, warn_on_javascript_compatibility);
-
 DEFINE_NATIVE_ENTRY(Identical_comparison, 2) {
   GET_NATIVE_ARGUMENT(Instance, a, arguments->NativeArgAt(0));
   GET_NATIVE_ARGUMENT(Instance, b, arguments->NativeArgAt(1));
   const bool is_identical = a.IsIdenticalTo(b);
-  if (FLAG_warn_on_javascript_compatibility) {
-    if (!is_identical) {
-      if (a.IsString()) {
-        if (String::Cast(a).Equals(b)) {
-          Report::JSWarningFromNative(
-              true,  // Identical_comparison is static.
-              "strings that are equal are also identical");
-        }
-      } else if (a.IsInteger()) {
-        if (b.IsDouble()) {
-          const int64_t a_value = Integer::Cast(a).AsInt64Value();
-          const double b_value = Double::Cast(b).value();
-          if (a_value == floor(b_value)) {
-            Report::JSWarningFromNative(
-                true,  // Identical_comparison is static.
-                "integer value and integral double value that are equal "
-                "are also identical");
-          }
-        }
-      } else if (a.IsDouble()) {
-        if (b.IsInteger()) {
-          const double a_value = Double::Cast(a).value();
-          const int64_t b_value = Integer::Cast(b).AsInt64Value();
-          if (floor(a_value) == b_value) {
-            Report::JSWarningFromNative(
-                true,  // Identical_comparison is static.
-                "integral double value and integer value that are equal "
-                "are also identical");
-          }
-        }
-      }
-    }
-  }
   return Bool::Get(is_identical).raw();
 }
 
 }  // namespace dart