Update CM API IDL to use SecureContext

chrome/browser/flag_descriptions.cc

 // Copyright 2017 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 "chrome/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 911 matching lines @@
 
 const char kRunAllFlashInAllowModeDescription[] =
     R"*(For sites that have been set to "allow" Flash content, run all )*"
     R"*(content including any that has been deemed unimportant.)*";
 
 const char kPinchScaleName[] = "Pinch scale";
 
 const char kPinchScaleDescription[] =
     "Enables experimental support for scale using pinch.";
 
-const char kCredentialManagerApiName[] = "Experimental Credential Manager API";
-
-const char kCredentialManagerApiDescription[] =
-    "Enables an experimental implementation of the Credential Manager API. "
-    "Don't enable this unless you know what you're doing.";
-
 const char kReducedReferrerGranularityName[] =
     "Reduce default 'referer' header granularity.";
 
 const char kReducedReferrerGranularityDescription[] =
     "If a page hasn't set an explicit referrer policy, setting this flag "
     "will reduce the amount of information in the 'referer' header for "
     "cross-origin requests.";
 
 #if defined(OS_CHROMEOS)
 
@@ skipping 2080 matching lines @@
 
 const char kAutoplayPolicyNoUserGestureRequired[] =
     "No user gesture is required.";
 
 const char kAutoplayPolicyUserGestureRequired[] = "User gesture is required.";
 
 const char kAutoplayPolicyCrossOriginUserGestureRequired[] =
     "User gesture is required for cross-origin iframes.";
 
 }  // namespace flag_descriptions