[inspector] removed old v8_inspector::Channel API

include/v8-inspector.h

 // Copyright 2016 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_V8_INSPECTOR_H_
 #define V8_V8_INSPECTOR_H_
 
 #include <stdint.h>
 #include <cctype>
 
@@ skipping 230 matching lines @@
       v8::Local<v8::Value> exception, const StringView& detailedMessage,
       const StringView& url, unsigned lineNumber, unsigned columnNumber,
       std::unique_ptr<V8StackTrace>, int scriptId) = 0;
   virtual void exceptionRevoked(v8::Local<v8::Context>, unsigned exceptionId,
                                 const StringView& message) = 0;
 
   // Connection.
   class V8_EXPORT Channel {
    public:
     virtual ~Channel() {}
-    virtual void sendProtocolResponse(int callId, const StringView& message) {}
-    virtual void sendProtocolNotification(const StringView& message) {}
     virtual void sendResponse(int callId,
-                              std::unique_ptr<StringBuffer> message) {
-      sendProtocolResponse(callId, message->string());
-    }
-    virtual void sendNotification(std::unique_ptr<StringBuffer> message) {
-      sendProtocolNotification(message->string());
-    }
+                              std::unique_ptr<StringBuffer> message) = 0;
+    virtual void sendNotification(std::unique_ptr<StringBuffer> message) = 0;
     virtual void flushProtocolNotifications() = 0;
   };
   virtual std::unique_ptr<V8InspectorSession> connect(
       int contextGroupId, Channel*, const StringView& state) = 0;
 
   // API methods.
   virtual std::unique_ptr<V8StackTrace> createStackTrace(
       v8::Local<v8::StackTrace>) = 0;
   virtual std::unique_ptr<V8StackTrace> captureStackTrace(bool fullStack) = 0;
 };
 
 }  // namespace v8_inspector
 
 #endif  // V8_V8_INSPECTOR_H_