[WeakMemoryCache] Cleanup Field-Trial code

chrome/browser/about_flags.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/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1996 matching lines @@
 #if defined(OS_ANDROID)
     {"enable-vr-shell", IDS_FLAGS_ENABLE_VR_SHELL_NAME,
      IDS_FLAGS_ENABLE_VR_SHELL_DESCRIPTION, kOsAndroid,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableVrShell,
                                switches::kDisableVrShell)},
     {"enable-android-pay-integration-v1",
      IDS_FLAGS_ENABLE_ANDROID_PAY_INTEGRATION_V1_NAME,
      IDS_FLAGS_ENABLE_ANDROID_PAY_INTEGRATION_V1_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kAndroidPayIntegrationV1)},
 #endif
-    {"enable-weak-memorycache", IDS_FLAGS_ENABLE_WEAK_MEMORYCACHE_NAME,
-     IDS_FLAGS_ENABLE_WEAK_MEMORYCACHE_DESCRIPTION, kOsAll,
-     FEATURE_VALUE_TYPE(features::kWeakMemoryCache)},
 #if defined(OS_CHROMEOS)
     {"disable-eol-notification", IDS_FLAGS_EOL_NOTIFICATION_NAME,
      IDS_FLAGS_EOL_NOTIFICATION_DESCRIPTION, kOsCrOS,
      SINGLE_DISABLE_VALUE_TYPE(chromeos::switches::kDisableEolNotification)},
 #endif  // defined(OS_CHROMEOS)
     {"fill-on-account-select", IDS_FILL_ON_ACCOUNT_SELECT_NAME,
      IDS_FILL_ON_ACCOUNT_SELECT_DESCRIPTION, kOsAll,
      FEATURE_VALUE_TYPE(password_manager::features::kFillOnAccountSelect)},
     {"new-audio-rendering-mixing-strategy",
      IDS_NEW_AUDIO_RENDERING_MIXING_STRATEGY_NAME,
@@ skipping 195 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags