Replace uses of hash_map in //base

base/trace_event/heap_profiler_heap_dump_writer.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 BASE_TRACE_EVENT_HEAP_PROFILER_HEAP_DUMP_WRITER_H_
 #define BASE_TRACE_EVENT_HEAP_PROFILER_HEAP_DUMP_WRITER_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <set>
+#include <unordered_map>
 
 #include "base/base_export.h"
-#include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
 
 namespace base {
 namespace trace_event {
 
 class MemoryDumpSessionState;
 class StackFrameDeduplicator;
 class TracedValue;
 class TypeNameDeduplicator;
 
 // Aggregates |metrics_by_context|, recursively breaks down the heap, and
 // returns a traced value with an "entries" array that can be dumped in the
 // trace log, following the format described in https://goo.gl/KY7zVE. The
 // number of entries is kept reasonable because long tails are not included.
 BASE_EXPORT std::unique_ptr<TracedValue> ExportHeapDump(
-    const hash_map<AllocationContext, AllocationMetrics>& metrics_by_context,
+    const std::unordered_map<AllocationContext, AllocationMetrics>&
+        metrics_by_context,
     const MemoryDumpSessionState& session_state);
 
 namespace internal {
 
 namespace {
 struct Bucket;
 }
 
 // An entry in the "entries" array as described in https://goo.gl/KY7zVE.
 struct BASE_EXPORT Entry {
@@ skipping 28 matching lines @@
                  TypeNameDeduplicator* type_name_deduplicator,
                  uint32_t breakdown_threshold_bytes);
 
   ~HeapDumpWriter();
 
   // Aggregates allocations to compute the total size of the heap, then breaks
   // down the heap recursively. This produces the values that should be dumped
   // in the "entries" array. The number of entries is kept reasonable because
   // long tails are not included. Use |Serialize| to convert to a traced value.
   const std::set<Entry>& Summarize(
-      const hash_map<AllocationContext, AllocationMetrics>& metrics_by_context);
+      const std::unordered_map<AllocationContext, AllocationMetrics>&
+          metrics_by_context);
 
  private:
   // Inserts an |Entry| for |Bucket| into |entries_|. Returns false if the
   // entry was present before, true if it was not.
   bool AddEntryForBucket(const Bucket& bucket);
 
   // Recursively breaks down a bucket into smaller buckets and adds entries for
   // the buckets worth dumping to |entries_|.
   void BreakDown(const Bucket& bucket);
 
@@ skipping 13 matching lines @@
   uint32_t breakdown_threshold_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(HeapDumpWriter);
 };
 
 }  // namespace internal
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_HEAP_PROFILER_HEAP_DUMP_WRITER_H_