Replace uses of hash_map in //base

base/trace_event/process_memory_dump_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/process_memory_dump.h"
 
 #include <stddef.h>
 
 #include "base/memory/aligned_memory.h"
 #include "base/memory/ptr_util.h"
@@ skipping 72 matching lines @@
   ASSERT_EQ(MemoryAllocatorDump::Flags::WEAK, shared_mad2->flags());
 
   traced_value.reset(new TracedValue);
   pmd1->AsValueInto(traced_value.get());
 
   pmd1.reset();
 }
 
 TEST(ProcessMemoryDumpTest, TakeAllDumpsFrom) {
   std::unique_ptr<TracedValue> traced_value(new TracedValue);
-  hash_map<AllocationContext, AllocationMetrics> metrics_by_context;
+  std::unordered_map<AllocationContext, AllocationMetrics> metrics_by_context;
   metrics_by_context[AllocationContext()] = { 1, 1 };
   TraceEventMemoryOverhead overhead;
 
   scoped_refptr<MemoryDumpSessionState> session_state =
       new MemoryDumpSessionState;
   session_state->SetStackFrameDeduplicator(
       WrapUnique(new StackFrameDeduplicator));
   session_state->SetTypeNameDeduplicator(
       WrapUnique(new TypeNameDeduplicator));
   std::unique_ptr<ProcessMemoryDump> pmd1(
@@ skipping 193 matching lines @@
       static_cast<char*>(base::AlignedAlloc(kVeryLargeMemorySize, page_size)));
   memset(memory2.get(), 0, kVeryLargeMemorySize);
   size_t res2 = ProcessMemoryDump::CountResidentBytes(memory2.get(),
                                                       kVeryLargeMemorySize);
   ASSERT_EQ(res2, kVeryLargeMemorySize);
 }
 #endif  // defined(COUNT_RESIDENT_BYTES_SUPPORTED)
 
 }  // namespace trace_event
 }  // namespace base