Prerender: Remove deprecated prerender experiment histograms.

chrome/browser/prerender/prerender_manager.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/prerender/prerender_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <functional>
@@ skipping 543 matching lines @@
 PrerenderManager::PrerenderManagerMode PrerenderManager::GetMode() {
   return mode_;
 }
 
 // static
 void PrerenderManager::SetMode(PrerenderManagerMode mode) {
   mode_ = mode;
 }
 
 // static
-const char* PrerenderManager::GetModeString() {
-  switch (mode_) {
-    case PRERENDER_MODE_DISABLED:
-      return "_Disabled";
-    case PRERENDER_MODE_ENABLED:
-    case PRERENDER_MODE_EXPERIMENT_PRERENDER_GROUP:
-      return "_Enabled";
-    case PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP:
-      return "_Control";
-    case PRERENDER_MODE_EXPERIMENT_MULTI_PRERENDER_GROUP:
-      return "_Multi";
-    case PRERENDER_MODE_EXPERIMENT_15MIN_TTL_GROUP:
-      return "_15MinTTL";
-    case PRERENDER_MODE_EXPERIMENT_NO_USE_GROUP:
-      return "_NoUse";
-    case PRERENDER_MODE_NOSTATE_PREFETCH:
-      return "_NoStatePrefetch";
-    case PRERENDER_MODE_MAX:
-    default:
-      NOTREACHED() << "Invalid PrerenderManager mode.";
-      break;
-  }
-  return "";
-}
-
-// static
 bool PrerenderManager::IsPrerenderingPossible() {
   return GetMode() != PRERENDER_MODE_DISABLED;
 }
 
 // static
 bool PrerenderManager::ActuallyPrerendering() {
   return IsPrerenderingPossible() && !IsControlGroup();
 }
 
 // static
@@ skipping 707 matching lines @@
   DCHECK_EQ(1u, erased);
 }
 
 void PrerenderManager::SetPrerenderContentsFactoryForTest(
     PrerenderContents::Factory* prerender_contents_factory) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   prerender_contents_factory_.reset(prerender_contents_factory);
 }
 
 }  // namespace prerender