Allow IO thread usage in WebRTC browsertests

chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc

Index: chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc
diff --git a/chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc b/chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc
index f7931d2570e33f09a7e91a06348ee37e48a5c5b4..ff7e2b34ef19808fbbca4f451cd0012368157314 100644
--- a/chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc
+++ b/chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc
@@ -16,6 +16,7 @@
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/test_timeouts.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ -344,11 +345,13 @@ INSTANTIATE_TEST_CASE_P(
 
 IN_PROC_BROWSER_TEST_P(WebRtcVideoQualityBrowserTest,
                        MANUAL_TestVideoQualityVp8) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   TestVideoQuality("VP8");
 }
 
 IN_PROC_BROWSER_TEST_P(WebRtcVideoQualityBrowserTest,
                        MANUAL_TestVideoQualityVp9) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   TestVideoQuality("VP9");
 }
 
@@ -356,6 +359,7 @@ IN_PROC_BROWSER_TEST_P(WebRtcVideoQualityBrowserTest,
 
 IN_PROC_BROWSER_TEST_P(WebRtcVideoQualityBrowserTest,
                        MANUAL_TestVideoQualityH264) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   // Only run test if run-time feature corresponding to |rtc_use_h264| is on.
   if (!base::FeatureList::IsEnabled(content::kWebRtcH264WithOpenH264FFmpeg)) {
     LOG(WARNING) << "Run-time feature WebRTC-H264WithOpenH264FFmpeg disabled. "