Remove implicit-int-conversion warnings.

webrtc/video_engine/overuse_frame_detector.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 232 matching lines @@
     }
     // Remove any old frames up to current.
     // Old frames have been skipped by the capture process thread.
     // TODO(asapersson): Consider measuring time from first frame in list.
     last_processing_time_ms_ = now - (*it).second;
     frame_times_.erase(frame_times_.begin(), ++it);
     return last_processing_time_ms_;
   }
 
   void Reset() { frame_times_.clear(); }
-  int NumFrames() const { return frame_times_.size(); }
+  int NumFrames() const { return static_cast<int>(frame_times_.size()); }
   int last_processing_time_ms() const { return last_processing_time_ms_; }
 
  private:
   // Captured frames mapped by the capture time.
   std::map<int64_t, int64_t> frame_times_;
   int last_processing_time_ms_;
 };
 
 // TODO(asapersson): Remove this class. Not used.
 // Class for calculating the capture queue delay change.
@@ skipping 310 matching lines @@
   bool underusing = false;
   if (options_.enable_capture_jitter_method) {
     underusing = capture_deltas_.StdDev() <
         options_.low_capture_jitter_threshold_ms;
   } else if (options_.enable_encode_usage_method) {
     underusing = usage_->Value() < options_.low_encode_usage_threshold_percent;
   }
   return underusing;
 }
 }  // namespace webrtc