[tracing] Simplify design of MemoryAllocatorDump

base/trace_event/memory_dump_provider.cc

 // 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 "base/trace_event/memory_dump_provider.h"
 
-#include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 
 namespace base {
 namespace trace_event {
 
 MemoryDumpProvider::MemoryDumpProvider() {
 }
 
 MemoryDumpProvider::MemoryDumpProvider(
     const scoped_refptr<SingleThreadTaskRunner>& task_runner)
     : task_runner_(task_runner) {
 }
 
 MemoryDumpProvider::~MemoryDumpProvider() {
 }
 
 void MemoryDumpProvider::DeclareAllocatorAttribute(
-    const MemoryAllocatorDeclaredAttribute& attr) {
-  DCHECK_EQ(0u, allocator_attributes_.count(attr.name))
-      << "Allocator attribute " << attr.name << " already declared for dumper "
-      << GetFriendlyName();
-  allocator_attributes_[attr.name] = attr;
+    const std::string& allocator_name,
+    const std::string& attribute_name,
+    const std::string& attribute_type) {
+  allocator_attributes_type_info_.Set(
+      allocator_name, attribute_name, attribute_type);
 }
 
 }  // namespace trace_event
 }  // namespace base