[inspector] Drop V8_VERSION checks.

src/inspector/V8ProfilerAgentImpl.h

 // Copyright 2015 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.
 
 #ifndef V8_INSPECTOR_V8PROFILERAGENTIMPL_H_
 #define V8_INSPECTOR_V8PROFILERAGENTIMPL_H_
 
 #include "src/inspector/Allocator.h"
 #include "src/inspector/protocol/Forward.h"
 #include "src/inspector/protocol/Profiler.h"
@@ skipping 27 matching lines @@
   void setSamplingInterval(ErrorString*, int) override;
   void start(ErrorString*) override;
   void stop(ErrorString*,
             std::unique_ptr<protocol::Profiler::Profile>*) override;
 
   void consoleProfile(const String16& title);
   void consoleProfileEnd(const String16& title);
 
  private:
   String16 nextProfileId();
-  v8::CpuProfiler* profiler();
 
   void startProfiling(const String16& title);
   std::unique_ptr<protocol::Profiler::Profile> stopProfiling(
       const String16& title, bool serialize);
 
   bool isRecording() const;
 
   V8InspectorSessionImpl* m_session;
   v8::Isolate* m_isolate;
   v8::CpuProfiler* m_profiler;
   protocol::DictionaryValue* m_state;
   protocol::Profiler::Frontend m_frontend;
   bool m_enabled;
   bool m_recordingCPUProfile;
   class ProfileDescriptor;
   std::vector<ProfileDescriptor> m_startedProfiles;
   String16 m_frontendInitiatedProfileId;
 };
 
 }  // namespace v8_inspector
 
 #endif  // V8_INSPECTOR_V8PROFILERAGENTIMPL_H_