ShapeDetection: Holding all of mock service to prevent GC

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 1faf89f7727c4a8bcbeb293978e3c643e5d2693a..76400577ecbcfc22bbaa2ce20bb24d7ad7b9fde1 100644
--- a/third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js
+++ b/third_party/WebKit/LayoutTests/shapedetection/resources/mock-facedetection.js
@@ -24,7 +24,7 @@ let mockFaceDetectionProviderReady = define(
     }
 
     getFrameData() {
-      return this.mock_service_.buffer_data_;
+      return this.mock_service_.bufferData_;
     }
 
     getMaxDetectedFaces() {
@@ -46,7 +46,7 @@ let mockFaceDetectionProviderReady = define(
 
     detect(frame_data, width, height) {
       let receivedStruct = mojo.mapBuffer(frame_data, 0, width*height*4, 0);
-      this.buffer_data_ = new Uint32Array(receivedStruct.buffer);
+      this.bufferData_ = new Uint32Array(receivedStruct.buffer);
       return Promise.resolve({
         result: {
           bounding_boxes: [