Use BITMAPINFOHEADER from capture capability enumeration when using MJPG

media/video/capture/win/capability_list_win.cc

 // 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.
 
 #include "media/video/capture/win/capability_list_win.h"
 
 #include <algorithm>
 #include <functional>
 
 #include "base/logging.h"
@@ skipping 21 matching lines @@
     return diff_width_lhs < diff_width_rhs;
 
   const float diff_fps_lhs = std::fabs(lhs.frame_rate - requested.frame_rate);
   const float diff_fps_rhs = std::fabs(rhs.frame_rate - requested.frame_rate);
   if (diff_fps_lhs != diff_fps_rhs)
     return diff_fps_lhs < diff_fps_rhs;
 
   return lhs.pixel_format < rhs.pixel_format;
 }
 
-CapabilityWin GetBestMatchedCapability(const VideoCaptureFormat& requested,
-                                       const CapabilityList& capabilities) {
+const CapabilityWin& GetBestMatchedCapability(
+  const VideoCaptureFormat& requested,
+  const CapabilityList& capabilities) {
   DCHECK(!capabilities.empty());
-  CapabilityWin best_match = capabilities.front();
+  const CapabilityWin* best_match = &(*capabilities.begin());
   for (const CapabilityWin& capability : capabilities) {
-    if (CompareCapability(requested, capability, best_match))
-      best_match = capability;
+    if (CompareCapability(requested, capability, *best_match))
+      best_match = &capability;
   }
-  return best_match;
+  return *best_match;
 }
 
 }  // namespace media