Delete IsMutable and IsExclusive methods.

webrtc/common_video/video_frame.cc

Index: webrtc/common_video/video_frame.cc
diff --git a/webrtc/common_video/video_frame.cc b/webrtc/common_video/video_frame.cc
index 4bd23f98dc06f796029f8fd4813355b91d11a813..978dde15b75eaa779a261d3c0636058e38556ef0 100644
--- a/webrtc/common_video/video_frame.cc
+++ b/webrtc/common_video/video_frame.cc
@@ -66,18 +66,7 @@ void VideoFrame::CreateEmptyFrame(int width,
   render_time_ms_ = 0;
   rotation_ = kVideoRotation_0;
 
-  // Check if it's safe to reuse allocation.
-  if (video_frame_buffer_ && video_frame_buffer_->IsMutable() &&
-      !video_frame_buffer_->native_handle() &&
-      width == video_frame_buffer_->width() &&
-      height == video_frame_buffer_->height() &&
-      stride_y == video_frame_buffer_->StrideY() &&
-      stride_u == video_frame_buffer_->StrideU() &&
-      stride_v == video_frame_buffer_->StrideV()) {
-    return;
-  }
-
-  // Need to allocate new buffer.
+  // Allocate a new buffer.
   video_frame_buffer_ = new rtc::RefCountedObject<I420Buffer>(
       width, height, stride_y, stride_u, stride_v);
 }