Revert "Ship the Credential Management API by default" from M50.

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index c7a8f476d799c7b13b8e543c6e4a876b28f4aff3..e46584163b3d5066f75508cf6519fd5fab42791f 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -139,8 +139,8 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
     WebRuntimeFeatures::enableNetworkInformation(true);
   }
 
-  if (!base::FeatureList::IsEnabled(features::kCredentialManagementAPI))
-    WebRuntimeFeatures::enableCredentialManagerAPI(false);
+  if (command_line.HasSwitch(switches::kEnableCredentialManagerAPI))
+    WebRuntimeFeatures::enableCredentialManagerAPI(true);
 
   if (command_line.HasSwitch(switches::kReducedReferrerGranularity))
     WebRuntimeFeatures::enableReducedReferrerGranularity(true);