ShapeDetection: use mojom::Bitmap for mojo interface.

third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js

Index: third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js
diff --git a/third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js b/third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js
index 8e48375370a12826de3f1166dd09208675d3080d..7c0305d33584a670128c571731acc2f6b85198b4 100644
--- a/third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js
+++ b/third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js
@@ -44,8 +44,8 @@ let mockFaceDetectionProviderReady = define(
                                            request);
     }
 
-    detect(frame_data, width, height) {
-      let receivedStruct = mojo.mapBuffer(frame_data, 0, width*height*4, 0);
+    detect(bitmap_data) {
+      let receivedStruct = new Uint8Array(bitmap_data.pixel_data);
       this.buffer_data_ = new Uint32Array(receivedStruct.buffer);
       return Promise.resolve({
         result: {
@@ -56,7 +56,6 @@ let mockFaceDetectionProviderReady = define(
           ]
         }
       });
-      mojo.unmapBuffer(receivedStruct.buffer);
     }
   }
   return new MockFaceDetectionProvider();