Remove autoplay-muted-videos feature flag.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index b045f2ecf2752308d38772f6df28142cd2a3c82f..956a194d1b0061b01718c4c102ba1838f4c6d82b 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1017,6 +1017,7 @@ void RenderView::ApplyWebPreferences(const WebPreferences& prefs,
       static_cast<WebSettings::ProgressBarCompletion>(
           prefs.progress_bar_completion));
   settings->setPreferHiddenVolumeControls(true);
+  settings->setSpellCheckEnabledByDefault(prefs.spellcheck_enabled_by_default);
 
   // Force preload=none and disable autoplay on older or low end Android
   // platforms because their media pipelines are not stable enough to handle
@@ -1025,10 +1026,8 @@ void RenderView::ApplyWebPreferences(const WebPreferences& prefs,
       base::android::BuildInfo::GetInstance()->sdk_int() <=
           base::android::SDK_VERSION_JELLY_BEAN_MR2 ||
       base::SysInfo::IsLowEndDevice();
+  // TODO(mlamouri): rename this setting "isLowEndDevice".
   settings->setForcePreloadNoneForMediaElements(is_low_end_device);
-  WebRuntimeFeatures::enableAutoplayMutedVideos(
-      prefs.autoplay_muted_videos_enabled && !is_low_end_device);
-  settings->setSpellCheckEnabledByDefault(prefs.spellcheck_enabled_by_default);
 #endif
 
   settings->setAutoplayExperimentMode(