Move VideoCodecType from common_types.h to api/video/video_codec_type.h

Bug: webrtc:7660
Change-Id: I9381364a64113dbb622b26acbf2b71228c3c4b96
Reviewed-on: https://webrtc-review.googlesource.com/c/111480
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25710}

rtc_base/BUILD.gn

@@ -78,7 +78,6 @@ rtc_source_set("rtc_base_approved") {
     ":safe_compare",
     ":safe_minmax",
     ":type_traits",
-    "..:webrtc_common",
     "../api:array_view",
     "../system_wrappers:field_trial",
     "experiments:field_trial_parser",

rtc_base/experiments/BUILD.gn

@@ -56,7 +56,6 @@ rtc_static_library("quality_scaling_experiment") {
   ]
   deps = [
     "../:rtc_base_approved",
-    "../..:webrtc_common",
     "../../api/video_codecs:video_codecs_api",
     "../../system_wrappers:field_trial",
     "//third_party/abseil-cpp/absl/types:optional",

rtc_base/experiments/quality_scaling_experiment.h

@@ -12,7 +12,6 @@
 
 #include "absl/types/optional.h"
 #include "api/video_codecs/video_encoder.h"
-#include "common_types.h"  // NOLINT(build/include)
 
 namespace webrtc {
 class QualityScalingExperiment {