DevTools: always use 16bit strings for inspector protocol.

third_party/WebKit/Source/platform/v8_inspector/V8ProfilerAgentImpl.cpp

 // Copyright 2015 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/V8ProfilerAgentImpl.h"
 
 #include "platform/v8_inspector/Atomics.h"
 #include "platform/v8_inspector/V8DebuggerImpl.h"
 #include "platform/v8_inspector/V8StackTraceImpl.h"
 #include "platform/v8_inspector/V8StringUtil.h"
@@ skipping 135 matching lines @@
     startProfiling(id);
     m_frontend->consoleProfileStarted(id, currentDebugLocation(m_debugger), title);
 }
 
 void V8ProfilerAgentImpl::consoleProfileEnd(const String16& title)
 {
     ASSERT(m_frontend && m_enabled);
     String16 id;
     String16 resolvedTitle;
     // Take last started profile if no title was passed.
-    if (title.isNull()) {
+    if (title.isEmpty()) {
         if (m_startedProfiles.isEmpty())
             return;
         id = m_startedProfiles.last().m_id;
         resolvedTitle = m_startedProfiles.last().m_title;
         m_startedProfiles.removeLast();
     } else {
         for (size_t i = 0; i < m_startedProfiles.size(); i++) {
             if (m_startedProfiles[i].m_title == title) {
                 resolvedTitle = title;
                 id = m_startedProfiles[i].m_id;
@@ skipping 125 matching lines @@
 }
 
 void V8ProfilerAgentImpl::idleStarted()
 {
     if (!isRecording())
         return;
     m_isolate->GetCpuProfiler()->SetIdle(true);
 }
 
 } // namespace blink