[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/protocol/memory_handler.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_PROTOCOL_MEMORY_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_MEMORY_HANDLER_H_
 
 #include "base/macros.h"
+#include "content/browser/devtools/protocol/devtools_domain_handler.h"
 #include "content/browser/devtools/protocol/memory.h"
 
 namespace content {
 namespace protocol {
 
-class MemoryHandler : public Memory::Backend {
+class MemoryHandler : public DevToolsDomainHandler,
+                      public Memory::Backend {
  public:
   MemoryHandler();
   ~MemoryHandler() override;
 
-  void Wire(UberDispatcher*);
-  Response Disable() override;
+  void Wire(UberDispatcher* dispatcher) override;
 
   Response SetPressureNotificationsSuppressed(bool suppressed) override;
   Response SimulatePressureNotification(const std::string& level) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MemoryHandler);
 };
 
 }  // namespace protocol
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_MEMORY_HANDLER_H_