[proxies] Improve error messages.

src/builtins.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/builtins.h"
 
 #include "src/api.h"
 #include "src/api-natives.h"
 #include "src/arguments.h"
 #include "src/base/once.h"
@@ skipping 1811 matching lines @@
   return *result;
 }
 
 
 namespace {
 
 // ES6 section 9.5.15 ProxyCreate (target, handler)
 MaybeHandle<JSProxy> ProxyCreate(Isolate* isolate, Handle<Object> target,
                                  Handle<Object> handler) {
   if (!target->IsJSReceiver()) {
-    THROW_NEW_ERROR(
-        isolate, NewTypeError(MessageTemplate::kProxyTargetNonObject), JSProxy);
+    THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kProxyNonObject),
+                    JSProxy);
   }
   if (target->IsJSProxy() && JSProxy::cast(*target)->IsRevoked()) {
     THROW_NEW_ERROR(isolate,
                     NewTypeError(MessageTemplate::kProxyHandlerOrTargetRevoked),
                     JSProxy);
   }
   if (!handler->IsJSReceiver()) {
-    THROW_NEW_ERROR(isolate,
-                    NewTypeError(MessageTemplate::kProxyHandlerNonObject),
+    THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kProxyNonObject),
                     JSProxy);
   }
   if (handler->IsJSProxy() && JSProxy::cast(*handler)->IsRevoked()) {
     THROW_NEW_ERROR(isolate,
                     NewTypeError(MessageTemplate::kProxyHandlerOrTargetRevoked),
                     JSProxy);
   }
   return isolate->factory()->NewJSProxy(Handle<JSReceiver>::cast(target),
                                         Handle<JSReceiver>::cast(handler));
 }
@@ skipping 662 matching lines @@
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 }  // namespace internal
 }  // namespace v8