Replace uses of hash_map in //base

base/path_service.cc

Index: base/path_service.cc
diff --git a/base/path_service.cc b/base/path_service.cc
index 1b9d3949300bb9c3286f8f365c8588a4540936fa..4715dfccb82c73749d6347afb8164720b80eb1e5 100644
--- a/base/path_service.cc
+++ b/base/path_service.cc
@@ -4,13 +4,14 @@
 
 #include "base/path_service.h"
 
+#include <unordered_map>
+
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
 #endif
 
-#include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
@@ -35,7 +36,7 @@ bool PathProviderPosix(int key, FilePath* result);
 
 namespace {
 
-typedef hash_map<int, FilePath> PathMap;
+typedef std::unordered_map<int, FilePath> PathMap;
 
 // We keep a linked list of providers.  In a debug build we ensure that no two
 // providers claim overlapping keys.