Switch cc to std::unordered_*.

cc/tiles/image_decode_controller.h

Index: cc/tiles/image_decode_controller.h
diff --git a/cc/tiles/image_decode_controller.h b/cc/tiles/image_decode_controller.h
index f63361af4699b35bdc53a5fa39ac249cb378dba7..22e1d4a2094658dd10ba858cbce93c49d9d2a0fd 100644
--- a/cc/tiles/image_decode_controller.h
+++ b/cc/tiles/image_decode_controller.h
@@ -7,7 +7,8 @@
 
 #include <stdint.h>
 
-#include "base/containers/hash_tables.h"
+#include <unordered_map>
+
 #include "base/memory/ref_counted.h"
 #include "cc/base/cc_export.h"
 #include "cc/playback/discardable_image_map.h"
@@ -42,11 +43,12 @@ class ImageDecodeController {
                                                     int layer_id,
                                                     uint64_t prepare_tiles_id);
 
-  using ImageTaskMap = base::hash_map<uint32_t, scoped_refptr<ImageDecodeTask>>;
-  using LayerImageTaskMap = base::hash_map<int, ImageTaskMap>;
+  using ImageTaskMap =
+      std::unordered_map<uint32_t, scoped_refptr<ImageDecodeTask>>;
+  using LayerImageTaskMap = std::unordered_map<int, ImageTaskMap>;
   LayerImageTaskMap image_decode_tasks_;
 
-  using LayerCountMap = base::hash_map<int, int>;
+  using LayerCountMap = std::unordered_map<int, int>;
   LayerCountMap used_layer_counts_;
 };