0989fbcad2
Reason for revert: Crashes perf tests, e.g., ./out/Debug/webrtc_perf_tests --gtest_filter='FullStackTest.ScreenshareSlidesVP8_2TL_VeryLossyNet' dies with an assert related to rtc::Optional. Original issue's description: > Delete VideoFrame default constructor, and IsZeroSize method. > > This ensures that the video_frame_buffer method never can return a > null pointer. > > BUG=webrtc:6591 > > Committed: https://crrev.com/bfcf561923a42005e4c7d66d8e72e5932155f997 > Cr-Commit-Position: refs/heads/master@{#15574} TBR=magjed@webrtc.org,stefan@webrtc.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=webrtc:6591 Review-Url: https://codereview.webrtc.org/2574123002 Cr-Commit-Position: refs/heads/master@{#15597}