Use StringView for String and AtomicString operator==.

third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 851 matching lines @@
     CRASH();
   }
 }
 
 bool isValidEnum(const String& value,
                  const char** validValues,
                  size_t length,
                  const String& enumName,
                  ExceptionState& exceptionState) {
   for (size_t i = 0; i < length; ++i) {
-    if (value == validValues[i])
+    // Avoid the strlen inside String::operator== (because of the StringView).
+    if (WTF::equal(value.impl(), validValues[i]))
       return true;
   }
   exceptionState.throwTypeError("The provided value '" + value +
                                 "' is not a valid enum value of type " +
                                 enumName + ".");
   return false;
 }
 
 bool isValidEnum(const Vector<String>& values,
                  const char** validValues,
@@ skipping 129 matching lines @@
   if (!v8Call(v8::JSON::Parse(isolate, v8String(isolate, stringifiedJSON)),
               parsed, tryCatch)) {
     if (tryCatch.HasCaught())
       exceptionState.rethrowV8Exception(tryCatch.Exception());
   }
 
   return parsed;
 }
 
 }  // namespace blink