Delete VideoFrame default constructor, and IsZeroSize method.

webrtc/video/vie_encoder.cc

 /*
  *  Copyright (c) 2012 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 60 matching lines @@
   size_t max_data_payload_length_;
   bool nack_enabled_;
 };
 
 class ViEEncoder::EncodeTask : public rtc::QueuedTask {
  public:
   EncodeTask(const VideoFrame& frame,
              ViEEncoder* vie_encoder,
              int64_t time_when_posted_in_ms,
              bool log_stats)
-      : vie_encoder_(vie_encoder),
+      : frame_(frame),
+        vie_encoder_(vie_encoder),
         time_when_posted_ms_(time_when_posted_in_ms),
         log_stats_(log_stats) {
-    frame_ = frame;
     ++vie_encoder_->posted_frames_waiting_for_encode_;
   }
 
  private:
   bool Run() override {
     RTC_DCHECK_RUN_ON(&vie_encoder_->encoder_queue_);
     RTC_DCHECK_GT(vie_encoder_->posted_frames_waiting_for_encode_.Value(), 0);
     vie_encoder_->stats_proxy_->OnIncomingFrame(frame_.width(),
                                                 frame_.height());
     ++vie_encoder_->captured_frame_count_;
@@ skipping 633 matching lines @@
   --scale_counter_[reason];
   source_proxy_->RequestHigherResolutionThan(current_pixel_count);
   LOG(LS_INFO) << "Scaling up resolution.";
   for (size_t i = 0; i < kScaleReasonSize; ++i) {
     LOG(LS_INFO) << "Scaled " << scale_counter_[i]
                  << " times for reason: " << (i ? "quality" : "cpu");
   }
 }
 
 }  // namespace webrtc