Replace uses of hash_map in //base

base/trace_event/heap_profiler_heap_dump_writer_unittest.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/heap_profiler_heap_dump_writer.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <set>
@@ skipping 161 matching lines @@
   std::string size;
   ASSERT_TRUE(json_entry->GetString("size", &size));
   ASSERT_EQ(large_value_str, size);
 
   std::string count;
   ASSERT_TRUE(json_entry->GetString("count", &count));
   ASSERT_EQ(large_value_str, count);
 }
 
 TEST(HeapDumpWriterTest, BacktraceTypeNameTable) {
-  hash_map<AllocationContext, AllocationMetrics> metrics_by_context;
+  std::unordered_map<AllocationContext, AllocationMetrics> metrics_by_context;
 
   AllocationContext ctx;
   ctx.backtrace.frames[0] = kBrowserMain;
   ctx.backtrace.frames[1] = kCreateWidget;
   ctx.backtrace.frame_count = 2;
   ctx.type_name = kInt;
 
   // 10 bytes with context { type: int, bt: [BrowserMain, CreateWidget] }.
   metrics_by_context[ctx] = {10, 5};
 
@@ skipping 74 matching lines @@
   AssertSizeAndCountEq(dump, bt_browser_main_create_widget, type_id_bool,
                        {18, 18});
 
   // The type breakdown of the entrie heap should have been dumped as well.
   AssertSizeAndCountEq(dump, -1, type_id_int, {10, 5});
   AssertSizeAndCountEq(dump, -1, type_id_bool, {48, 48});
   AssertSizeAndCountEq(dump, -1, type_id_string, {19, 4});
 }
 
 TEST(HeapDumpWriterTest, InsignificantValuesNotDumped) {
-  hash_map<AllocationContext, AllocationMetrics> metrics_by_context;
+  std::unordered_map<AllocationContext, AllocationMetrics> metrics_by_context;
 
   AllocationContext ctx;
   ctx.backtrace.frames[0] = kBrowserMain;
   ctx.backtrace.frames[1] = kCreateWidget;
   ctx.backtrace.frame_count = 2;
 
   // 0.5 KiB and 1 chunk in BrowserMain -> CreateWidget itself.
   metrics_by_context[ctx] = {512, 1};
 
   // 1 MiB and 1 chunk in BrowserMain -> CreateWidget -> GetBitmap.
@@ skipping 36 matching lines @@
                        {1024 * 1024 + 400 + 512, 3});
   AssertSizeAndCountEq(dump, bt_browser_main, -1, {1024 * 1024 + 400 + 512, 3});
 
   // Initialize was not significant, it should not have been dumped.
   AssertNotDumped(dump, bt_initialize, -1);
 }
 
 }  // namespace internal
 }  // namespace trace_event
 }  // namespace base