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

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 1d92d03c8ca012995bfb28ddae9e1c65405e505f..feb6494fd5a6cc6ee12415c17f05c1fcdbcb5597 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -325,6 +325,9 @@ const char kEnableLCDText[]                 = "enable-lcd-text";
 // Only valid if GPU rasterization is enabled as well.
 const char kEnableDistanceFieldText[]       = "enable-distance-field-text";
 
+// Enable the experimental Credential Manager JavaScript API.
+const char kEnableCredentialManagerAPI[]    = "enable-credential-manager-api";
+
 // Enable the creation of compositing layers when it would prevent LCD text.
 const char kEnablePreferCompositingToLCDText[] =
     "enable-prefer-compositing-to-lcd-text";