DevTools: remove methods used for native memory instrumentation

The instrumentation was dropped and the code is unused.

BUG=None

Review URL: https://codereview.chromium.org/510703002

Cr-Commit-Position: refs/heads/master@{#292117}

content/renderer/devtools/devtools_agent.cc

@@ -254,20 +254,6 @@ void DevToolsAgent::disableDeviceEmulation() {
   impl->DisableScreenMetricsEmulation();
 }
 
-#if defined(USE_TCMALLOC) && !defined(OS_WIN)
-static void AllocationVisitor(void* data, const void* ptr) {
-    typedef blink::WebDevToolsAgentClient::AllocatedObjectVisitor Visitor;
-    Visitor* visitor = reinterpret_cast<Visitor*>(data);
-    visitor->visitObject(ptr);
-}
-#endif
-
-void DevToolsAgent::visitAllocatedObjects(AllocatedObjectVisitor* visitor) {
-#if defined(USE_TCMALLOC) && !defined(OS_WIN)
-  IterateAllocatedObjects(&AllocationVisitor, visitor);
-#endif
-}
-
 // static
 DevToolsAgent* DevToolsAgent::FromRoutingId(int routing_id) {
   IdToAgentMap::iterator it = g_agent_for_routing_id.Get().find(routing_id);

content/renderer/devtools/devtools_agent.h

@@ -57,7 +57,6 @@ class DevToolsAgent : public RenderViewObserver,
       createClientMessageLoop() OVERRIDE;
   virtual void willEnterDebugLoop() OVERRIDE;
   virtual void didExitDebugLoop() OVERRIDE;
-  virtual void visitAllocatedObjects(AllocatedObjectVisitor* visitor) OVERRIDE;
 
   typedef void (*TraceEventCallback)(
       char phase, const unsigned char*, const char* name, unsigned long long id,