Set the Feature's ChannelForTesting to Trunk during ActiveTabTest.

chrome/common/extensions/features/feature.cc

Index: chrome/common/extensions/features/feature.cc
diff --git a/chrome/common/extensions/features/feature.cc b/chrome/common/extensions/features/feature.cc
index 550f9e31ce2269557d9d86ca4aff7e0b0cba4318..7aed0a8f7b8de621b0d70165f3de9ab0b637c47d 100644
--- a/chrome/common/extensions/features/feature.cc
+++ b/chrome/common/extensions/features/feature.cc
@@ -369,4 +369,11 @@ void Feature::ResetChannelForTesting() {
   g_channel.Get().ResetChannelForTesting();
 }
 
+// static
+chrome::VersionInfo::Channel Feature::GetCurrentChannel() {
+  if (g_channel_checking_enabled)
+    return g_channel.Get().GetChannel();
+  return chrome::VersionInfo::GetChannel();
+}
+
 }  // namespace