Remove support for Javascript warnings in the VM.

runtime/vm/exceptions.cc

Index: runtime/vm/exceptions.cc
diff --git a/runtime/vm/exceptions.cc b/runtime/vm/exceptions.cc
index 7cabfefcf4c4ae4c3f530f9f6fe4cb637cf88988..27b3852a661b41583d0cbba8f9a26ab5bc6cd040 100644
--- a/runtime/vm/exceptions.cc
+++ b/runtime/vm/exceptions.cc
@@ -635,14 +635,6 @@ RawObject* Exceptions::Create(ExceptionType type, const Array& arguments) {
       library = Library::IsolateLibrary();
       class_name = &Symbols::IsolateSpawnException();
       break;
-    case kJavascriptIntegerOverflowError:
-      library = Library::CoreLibrary();
-      class_name = &Symbols::JavascriptIntegerOverflowError();
-      break;
-    case kJavascriptCompatibilityError:
-      library = Library::CoreLibrary();
-      class_name = &Symbols::JavascriptCompatibilityError();
-      break;
     case kAssertion:
       library = Library::CoreLibrary();
       class_name = &Symbols::AssertionError();
@@ -680,15 +672,6 @@ RawObject* Exceptions::Create(ExceptionType type, const Array& arguments) {
 }
 
 
-// Throw JavascriptCompatibilityError exception.
-void Exceptions::ThrowJavascriptCompatibilityError(const char* msg) {
-  const Array& exc_args = Array::Handle(Array::New(1));
-  const String& msg_str = String::Handle(String::New(msg));
-  exc_args.SetAt(0, msg_str);
-  Exceptions::ThrowByType(Exceptions::kJavascriptCompatibilityError, exc_args);
-}
-
-
 static bool IsLikelyInternalDart2JSCrash(const Stacktrace& stacktrace) {
   Function& function = Function::Handle();
   String& name = String::Handle();