Remove uses of base::hash_map from //chrome

chrome/browser/media_galleries/fileapi/media_path_filter.h

Index: chrome/browser/media_galleries/fileapi/media_path_filter.h
diff --git a/chrome/browser/media_galleries/fileapi/media_path_filter.h b/chrome/browser/media_galleries/fileapi/media_path_filter.h
index 6e9fe5b3a3f255c443b096341a3dbccc377353a8..ce876050956366b352f8e82d6049860246ccdda9 100644
--- a/chrome/browser/media_galleries/fileapi/media_path_filter.h
+++ b/chrome/browser/media_galleries/fileapi/media_path_filter.h
@@ -7,10 +7,10 @@
 
 #include <stddef.h>
 
+#include <map>
 #include <string>
 #include <vector>
 
-#include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/sequence_checker.h"
@@ -45,7 +45,7 @@ class MediaPathFilter {
 
   // Key: .extension
   // Value: MediaGalleryFileType, but stored as an int to allow "|="
-  typedef base::hash_map<base::FilePath::StringType, int> MediaFileExtensionMap;
+  using MediaFileExtensionMap = std::map<base::FilePath::StringType, int>;
 
   void EnsureInitialized();