DevTools: always use 16bit strings for inspector protocol.

third_party/WebKit/Source/platform/v8_inspector/V8Regex.cpp

 // Copyright 2016 The Chromium 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 "platform/v8_inspector/V8Regex.h"
 
 #include "platform/v8_inspector/V8DebuggerImpl.h"
 #include "platform/v8_inspector/V8StringUtil.h"
 #include "platform/v8_inspector/public/V8DebuggerClient.h"
 
@@ skipping 17 matching lines @@
     v8::Local<v8::RegExp> regex;
     if (v8::RegExp::New(context, toV8String(isolate, pattern), static_cast<v8::RegExp::Flags>(flags)).ToLocal(&regex))
         m_regex.Reset(isolate, regex);
 }
 
 int V8Regex::match(const String16& string, int startFrom, int* matchLength) const
 {
     if (matchLength)
         *matchLength = 0;
 
-    if (m_regex.IsEmpty() || string.isNull())
+    if (m_regex.IsEmpty() || string.isEmpty())
         return -1;
 
     // v8 strings are limited to int.
     if (string.length() > INT_MAX)
         return -1;
 
     v8::Isolate* isolate = m_debugger->isolate();
     v8::HandleScope handleScope(isolate);
     v8::Local<v8::Context> context = m_debugger->regexContext();
     v8::Context::Scope contextScope(context);
@@ skipping 27 matching lines @@
         v8::Local<v8::Value> match;
         if (!result->Get(context, 0).ToLocal(&match))
             return -1;
         *matchLength = match.As<v8::String>()->Length();
     }
 
     return matchOffset.As<v8::Int32>()->Value() + startFrom;
 }
 
 } // namespace blink