Revert "Update VP9EncoderImpl to use EncodedImage::Allocate"

This reverts commit e12778cb3a7c35b4d3b9d25104841dccd67dc59b.

Reason for revert: Suspect for performance regression.

Bug: chromium:931692

Original change's description:
> Update VP9EncoderImpl to use EncodedImage::Allocate
> 
> Bug: webrtc:9378
> Change-Id: I009138b4dc50c4ceb8f94fee6a958bbfa4d7e326
> Reviewed-on: https://webrtc-review.googlesource.com/c/121771
> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
> Reviewed-by: Philip Eliasson <philipel@webrtc.org>
> Commit-Queue: Niels Moller <nisse@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#26593}

TBR=brandtr@webrtc.org,nisse@webrtc.org,philipel@webrtc.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: webrtc:9378
Change-Id: If056d5604f11b0b77b3f98a3e18d2a5790230760
Reviewed-on: https://webrtc-review.googlesource.com/c/123065
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26688}
diff --git a/modules/video_coding/codecs/vp9/vp9_impl.cc b/modules/video_coding/codecs/vp9/vp9_impl.cc
index b882a4e..5feca0b 100644
--- a/modules/video_coding/codecs/vp9/vp9_impl.cc
+++ b/modules/video_coding/codecs/vp9/vp9_impl.cc
@@ -185,7 +185,10 @@
 int VP9EncoderImpl::Release() {
   int ret_val = WEBRTC_VIDEO_CODEC_OK;
 
-  encoded_image_.Allocate(0);
+  if (encoded_image_.buffer() != nullptr) {
+    delete[] encoded_image_.buffer();
+    encoded_image_.set_buffer(nullptr, 0);
+  }
   if (encoder_ != nullptr) {
     if (inited_) {
       if (vpx_codec_destroy(encoder_)) {
@@ -387,9 +390,12 @@
   is_svc_ = (num_spatial_layers_ > 1 || num_temporal_layers_ > 1);
 
   // Allocate memory for encoded image
+  if (encoded_image_.data() != nullptr) {
+    delete[] encoded_image_.data();
+  }
   size_t frame_capacity =
       CalcBufferSize(VideoType::kI420, codec_.width, codec_.height);
-  encoded_image_.Allocate(frame_capacity);
+  encoded_image_.set_buffer(new uint8_t[frame_capacity], frame_capacity);
   encoded_image_._completeFrame = true;
   // Populate encoder configuration with default values.
   if (vpx_codec_enc_config_default(vpx_codec_vp9_cx(), config_, 0)) {
@@ -1260,7 +1266,9 @@
   }
 
   if (pkt->data.frame.sz > encoded_image_.capacity()) {
-    encoded_image_.Allocate(pkt->data.frame.sz);
+    delete[] encoded_image_.buffer();
+    encoded_image_.set_buffer(new uint8_t[pkt->data.frame.sz],
+                              pkt->data.frame.sz);
   }
   memcpy(encoded_image_.data(), pkt->data.frame.buf, pkt->data.frame.sz);
   encoded_image_.set_size(pkt->data.frame.sz);