Windows video capture: Remove duplicated code from GetDeviceSupportedFormats*

media/video/capture/win/capability_list_win.cc

Index: media/video/capture/win/capability_list_win.cc
diff --git a/media/video/capture/win/capability_list_win.cc b/media/video/capture/win/capability_list_win.cc
index 9b4531b82820107c2908b61dd6fe0ddfdf366d4d..983896498ee60122eeaeae72f2b58b4eee4a79f3 100644
--- a/media/video/capture/win/capability_list_win.cc
+++ b/media/video/capture/win/capability_list_win.cc
@@ -71,9 +71,7 @@ const VideoCaptureCapabilityWin& CapabilityList::GetBestMatchedFormat(
         it->supported_format.frame_size.height() - requested_height;
     // The 1000 allows using integer arithmetic for f.i. 29.971 fps.
     diff.diff_frame_rate =
-        1000 * ((static_cast<float>(it->frame_rate_numerator) /
-                 it->frame_rate_denominator) -
-                requested_frame_rate);
+        1000 * (it->supported_format.frame_rate - requested_frame_rate);
     diff_list.push_back(diff);
   }
 
@@ -117,4 +115,12 @@ const VideoCaptureCapabilityWin& CapabilityList::GetBestMatchedFormat(
   return *diff_list.front().capability;
 }
 
+void CapabilityList::CapabilitiesToVideoCaptureFormats(
+    VideoCaptureFormats* formats) const {
+  for (Capabilities::const_iterator it = capabilities_.begin();
+       it != capabilities_.end(); ++it) {
+    formats->push_back(it->supported_format);
+  }
+}
+
 }  // namespace media