Revert r42156, r42157, r42160. Allow dynamic switching in and out of sidetabs...

chrome/browser/browser.cc

Index: chrome/browser/browser.cc
===================================================================
--- chrome/browser/browser.cc	(revision 42174)
+++ chrome/browser/browser.cc	(working copy)
@@ -190,7 +190,6 @@
 
   encoding_auto_detect_.Init(prefs::kWebKitUsesUniversalDetector,
                              profile_->GetPrefs(), NULL);
-  use_vertical_tabs_.Init(prefs::kUseVerticalTabs, profile_->GetPrefs(), this);
 }
 
 Browser::~Browser() {
@@ -1567,7 +1566,7 @@
   prefs->RegisterBooleanPref(prefs::kWebAppCreateOnDesktop, true);
   prefs->RegisterBooleanPref(prefs::kWebAppCreateInAppsMenu, true);
   prefs->RegisterBooleanPref(prefs::kWebAppCreateInQuickLaunchBar, true);
-  prefs->RegisterBooleanPref(prefs::kUseVerticalTabs, false);
+  prefs->RegisterBooleanPref(prefs::kUseVerticalTabs, true);
   prefs->RegisterBooleanPref(prefs::kEnableTranslate, true);
 }
 
@@ -1995,15 +1994,6 @@
                        BookmarkEditor::SHOW_TREE, NULL);
 }
 
-bool Browser::UseVerticalTabs() const {
-  return use_vertical_tabs_.GetValue();
-}
-
-void Browser::ToggleUseVerticalTabs() {
-  use_vertical_tabs_.SetValue(!UseVerticalTabs());
-  window()->ToggleTabStripMode();
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 // Browser, TabStripModelObserver implementation: