Replace uses of hash_map in //base

third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp

Index: third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
diff --git a/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp b/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
index 0ded4382f690281bc9fa9962c3907df152352c72..84e221517da6ffbecb161e0bd18b9928e0929e1d 100644
--- a/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
+++ b/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
@@ -4,6 +4,8 @@
 
 #include "platform/PartitionAllocMemoryDumpProvider.h"
 
+#include <unordered_map>
+
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
@@ -136,8 +138,8 @@ bool PartitionAllocMemoryDumpProvider::OnMemoryDump(
   if (is_heap_profiling_enabled_) {
     // Overhead should always be reported, regardless of light vs. heavy.
     base::trace_event::TraceEventMemoryOverhead overhead;
-    base::hash_map<base::trace_event::AllocationContext,
-                   base::trace_event::AllocationMetrics>
+    std::unordered_map<base::trace_event::AllocationContext,
+                       base::trace_event::AllocationMetrics>
         metrics_by_context;
     {
       MutexLocker locker(allocation_register_mutex_);