Remove Exynos from MediaCodec blacklist. Limit MediaTek blacklist.

content/common/gpu/media/android_video_encode_accelerator.cc

Index: content/common/gpu/media/android_video_encode_accelerator.cc
diff --git a/content/common/gpu/media/android_video_encode_accelerator.cc b/content/common/gpu/media/android_video_encode_accelerator.cc
index c170716eb3b8c1856eaef8e5d6b4a0c4ce0c5ca3..5feccaf1fe2c511aa7999abf0fada90f8a5bc0af 100644
--- a/content/common/gpu/media/android_video_encode_accelerator.cc
+++ b/content/common/gpu/media/android_video_encode_accelerator.cc
@@ -114,6 +114,11 @@ AndroidVideoEncodeAccelerator::GetSupportedProfiles() {
   };
 
   for (const auto& supported_codec : kSupportedCodecs) {
+    if (supported_codec.codec == media::kCodecVP8 &&
+        !media::MediaCodecUtil::IsVp8EncoderAvailable()) {
+      continue;
+    }
+
     if (VideoCodecBridge::IsKnownUnaccelerated(supported_codec.codec,
                                                media::MEDIA_CODEC_ENCODER)) {
       continue;