Replace uses of hash_map in //base

third_party/WebKit/Source/platform/instrumentation/tracing/web_process_memory_dump.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 WebProcessMemoryDump_h
 #define WebProcessMemoryDump_h
 
 #include <map>
 #include <memory>
+#include <unordered_map>
 #include <vector>
+
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
 #include "base/trace_event/memory_dump_request_args.h"
 #include "platform/PlatformExport.h"
 #include "platform/instrumentation/tracing/web_memory_allocator_dump.h"
 #include "platform/wtf/HashMap.h"
 #include "platform/wtf/text/WTFString.h"
 
 class SkTraceMemoryDump;
@@ skipping 96 matching lines @@
   const base::trace_event::ProcessMemoryDump* process_memory_dump() const {
     return process_memory_dump_;
   }
 
   blink::WebMemoryAllocatorDump* CreateDiscardableMemoryAllocatorDump(
       const std::string& name,
       base::DiscardableMemory* discardable);
 
   // Dumps heap memory usage. |allocatorName| is used as an absolute name for
   // base::trace_event::ProcessMemoryDump::DumpHeapUsage().
-  void DumpHeapUsage(const base::hash_map<base::trace_event::AllocationContext,
-                                          base::trace_event::AllocationMetrics>&
-                         metrics_by_context,
-                     base::trace_event::TraceEventMemoryOverhead& overhead,
-                     const char* allocator_name);
+  void DumpHeapUsage(
+      const std::unordered_map<base::trace_event::AllocationContext,
+                               base::trace_event::AllocationMetrics>&
+          metrics_by_context,
+      base::trace_event::TraceEventMemoryOverhead& overhead,
+      const char* allocator_name);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(WebProcessMemoryDumpTest, IntegrationTest);
 
   blink::WebMemoryAllocatorDump* CreateWebMemoryAllocatorDump(
       base::trace_event::MemoryAllocatorDump* memory_allocator_dump);
 
   // Only for the case of ProcessMemoryDump being owned (i.e. the default ctor).
   std::unique_ptr<base::trace_event::ProcessMemoryDump>
       owned_process_memory_dump_;
@@ skipping 17 matching lines @@
   // Stores SkTraceMemoryDump for the current ProcessMemoryDump.
   std::vector<std::unique_ptr<skia::SkiaTraceMemoryDumpImpl>>
       sk_trace_dump_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WebProcessMemoryDump);
 };
 
 }  // namespace blink
 
 #endif  // WebProcessMemoryDump_h