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

content/public/common/content_features.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "build/build_config.h"
 #include "content/public/common/content_features.h"
 
 namespace features {
 
 // All features in alphabetical order.
 
 // Enables brotli "Accept-Encoding" advertising and "Content-Encoding" support.
 // Brotli format specification: http://www.ietf.org/id/draft-alakuijala-brotli
 const base::Feature kBrotliEncoding{"brotli-encoding",
                                     base::FEATURE_DISABLED_BY_DEFAULT};
 
-// Enables the credential management API:
-// https://w3c.github.io/webappsec-credential-management/
-const base::Feature kCredentialManagementAPI{"CredentialManagementAPI",
-                                             base::FEATURE_ENABLED_BY_DEFAULT};
-
 // Downloads resumption will be controllable via a flag until it's enabled
 // permanently. See https://crbug.com/7648
 const base::Feature kDownloadResumption{"DownloadResumption",
                                         base::FEATURE_DISABLED_BY_DEFAULT};
 
 // The Experimental Framework for controlling access to API experiments.
 const base::Feature kExperimentalFramework{"ExperimentalFramework",
                                            base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Non-validating reload on reload-to-refresh-content (e.g. pull-to-refresh).
@@ skipping 36 matching lines @@
 // we will not use replica editor and do a round trip to renderer to synchronize
 // with Blink data.
 const base::Feature kImeThread{"ImeThread", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // FeatureList definition for the Seccomp field trial.
 const base::Feature kSeccompSandboxAndroid{"SeccompSandboxAndroid",
                                            base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
 }  // namespace features