Change fill-on-account-select to use Features API, not a custom flag

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2012 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/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 1540 matching lines @@
 
     MaybeAppendBlinkSettingsSwitchForFieldTrial(
         browser_command_line, command_line);
 
     // Please keep this in alphabetical order.
     static const char* const kSwitchNames[] = {
 #if defined(OS_ANDROID)
       autofill::switches::kDisableAccessorySuggestionView,
       autofill::switches::kEnableAccessorySuggestionView,
 #endif
-      autofill::switches::kDisableFillOnAccountSelect,
       autofill::switches::kDisablePasswordGeneration,
-      autofill::switches::kEnableFillOnAccountSelect,
       autofill::switches::kEnablePasswordGeneration,
       autofill::switches::kEnableSingleClickAutofill,
       autofill::switches::kEnableSuggestionsWithSubstringMatch,
       autofill::switches::kIgnoreAutocompleteOffForAutofill,
       autofill::switches::kLocalHeuristicsOnlyForPasswordGeneration,
 #if defined(ENABLE_EXTENSIONS)
       extensions::switches::kAllowHTTPBackgroundPage,
       extensions::switches::kAllowLegacyExtensionManifests,
       extensions::switches::kEnableAppWindowControls,
       extensions::switches::kEnableEmbeddedExtensionOptions,
@@ skipping 1384 matching lines @@
   if (channel <= kMaxDisableEncryptionChannel) {
     static const char* const kWebRtcDevSwitchNames[] = {
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)