Remove some LatencyInfo merging code path

cc/output/compositor_frame_metadata.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_OUTPUT_COMPOSITOR_FRAME_METADATA_H_
 #define CC_OUTPUT_COMPOSITOR_FRAME_METADATA_H_
 
+#include <vector>
+
 #include "cc/base/cc_export.h"
 #include "ui/events/latency_info.h"
 #include "ui/gfx/size_f.h"
 #include "ui/gfx/vector2d_f.h"
 
 namespace cc {
 
 class CC_EXPORT CompositorFrameMetadata {
  public:
   CompositorFrameMetadata();
@@ skipping 13 matching lines @@
   gfx::SizeF root_layer_size;
   float min_page_scale_factor;
   float max_page_scale_factor;
 
   // Used to position the Android location top bar and page content, whose
   // precise position is computed by the renderer compositor.
   gfx::Vector2dF location_bar_offset;
   gfx::Vector2dF location_bar_content_translation;
   float overdraw_bottom_height;
 
-  ui::LatencyInfo latency_info;
+  std::vector<ui::LatencyInfo> latency_info;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_COMPOSITOR_FRAME_METADATA_H_