Replace uses of hash_map in //base

base/trace_event/malloc_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/malloc_dump_provider.h"
 
 #include <stddef.h>
 
+#include <unordered_map>
+
 #include "base/allocator/allocator_extension.h"
 #include "base/allocator/allocator_shim.h"
 #include "base/allocator/features.h"
 #include "base/debug/profiler.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 #include "base/trace_event/heap_profiler_allocation_register.h"
 #include "base/trace_event/heap_profiler_heap_dump_writer.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 270 matching lines @@
   // was enabled (--enable-heap-profiling) AND a DETAILED dump is requested.
   // However, when enabled, the overhead of the heap profiler should be always
   // reported to avoid oscillations of the malloc total in LIGHT dumps.
 
   tid_dumping_heap_ = PlatformThread::CurrentId();
   // At this point the Insert/RemoveAllocation hooks will ignore this thread.
   // Enclosing all the temporariy data structures in a scope, so that the heap
   // profiler does not see unabalanced malloc/free calls from these containers.
   {
     TraceEventMemoryOverhead overhead;
-    hash_map<AllocationContext, AllocationMetrics> metrics_by_context;
+    std::unordered_map<AllocationContext, AllocationMetrics> metrics_by_context;
     {
       AutoLock lock(allocation_register_lock_);
       if (allocation_register_) {
         if (args.level_of_detail == MemoryDumpLevelOfDetail::DETAILED) {
           for (const auto& alloc_size : *allocation_register_) {
             AllocationMetrics& metrics = metrics_by_context[alloc_size.context];
             metrics.size += alloc_size.size;
             metrics.count++;
           }
         }
@@ skipping 59 matching lines @@
       tid_dumping_heap_ == PlatformThread::CurrentId())
     return;
   AutoLock lock(allocation_register_lock_);
   if (!allocation_register_)
     return;
   allocation_register_->Remove(address);
 }
 
 }  // namespace trace_event
 }  // namespace base