Do not truncate message strings.

src/messages.cc

Index: src/messages.cc
diff --git a/src/messages.cc b/src/messages.cc
index 5e050bd2909f17fcf4a27433c30f9ad15cc61093..7193392d9d1c30a196efb43407327c6d369e0348 100644
--- a/src/messages.cc
+++ b/src/messages.cc
@@ -332,7 +332,6 @@ MaybeHandle<String> MessageTemplate::FormatMessage(int template_index,
                                                    Handle<String> arg0,
                                                    Handle<String> arg1,
                                                    Handle<String> arg2) {
-  static const int kMaxArgLength = 256;
   Isolate* isolate = arg0->GetIsolate();
   const char* template_string;
   switch (template_index) {
@@ -361,16 +360,7 @@ MaybeHandle<String> MessageTemplate::FormatMessage(int template_index,
       } else {
         DCHECK(i < arraysize(args));
         Handle<String> arg = args[i++];
-        int length = arg->length();
-        if (length > kMaxArgLength) {
-          builder.AppendString(
-              isolate->factory()->NewSubString(arg, 0, kMaxArgLength - 6));
-          builder.AppendCString("...");
-          builder.AppendString(
-              isolate->factory()->NewSubString(arg, length - 3, length));
-        } else {
-          builder.AppendString(arg);
-        }
+        builder.AppendString(arg);
       }
     } else {
       builder.AppendCharacter(*c);