Removes --enable-stacked-tab-strip flag (Stacked Tabs)

chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc

Index: chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
diff --git a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
index f88871dc5149f53c20676153dbd3832bc0dca539..7cb7394fb5aa9446e65189547e741ef0134f6cb8 100644
--- a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
+++ b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
@@ -59,25 +59,16 @@ TabRendererData::NetworkState TabContentsNetworkState(
   return TabRendererData::NETWORK_STATE_LOADING;
 }
 
-TabStripLayoutType DetermineTabStripLayout(
+bool DetermineTabStripLayoutStacked(
     PrefService* prefs,
     chrome::HostDesktopType host_desktop_type,
     bool* adjust_layout) {
   *adjust_layout = false;
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableStackedTabStrip)) {
-    return TAB_STRIP_LAYOUT_STACKED;
-  }
   // For ash, always allow entering stacked mode.
   if (host_desktop_type != chrome::HOST_DESKTOP_TYPE_ASH)
-    return TAB_STRIP_LAYOUT_SHRINK;
+    return false;
   *adjust_layout = true;
-  switch (prefs->GetInteger(prefs::kTabStripLayoutType)) {
-    case TAB_STRIP_LAYOUT_STACKED:
-      return TAB_STRIP_LAYOUT_STACKED;
-    default:
-      return TAB_STRIP_LAYOUT_SHRINK;
-  }
+  return prefs->GetBoolean(prefs::kTabStripStackedLayout);
 }
 
 // Get the MIME type of the file pointed to by the url, based on the file's
@@ -201,7 +192,7 @@ BrowserTabStripController::BrowserTabStripController(Browser* browser,
 
   local_pref_registrar_.Init(g_browser_process->local_state());
   local_pref_registrar_.Add(
-      prefs::kTabStripLayoutType,
+      prefs::kTabStripStackedLayout,
       base::Bind(&BrowserTabStripController::UpdateLayoutType,
                  base::Unretained(this)));
 }
@@ -392,15 +383,15 @@ bool BrowserTabStripController::IsIncognito() {
 
 void BrowserTabStripController::LayoutTypeMaybeChanged() {
   bool adjust_layout = false;
-  TabStripLayoutType layout_type =
-      DetermineTabStripLayout(g_browser_process->local_state(),
-                              browser_->host_desktop_type(), &adjust_layout);
-  if (!adjust_layout || layout_type == tabstrip_->layout_type())
+  bool stacked_layout =
+      DetermineTabStripLayoutStacked(g_browser_process->local_state(),
+                                     browser_->host_desktop_type(),
+                                     &adjust_layout);
+  if (!adjust_layout || stacked_layout == tabstrip_->stacked_layout())
     return;
 
-  g_browser_process->local_state()->SetInteger(
-      prefs::kTabStripLayoutType,
-      static_cast<int>(tabstrip_->layout_type()));
+  g_browser_process->local_state()->SetBoolean(prefs::kTabStripStackedLayout,
+                                               tabstrip_->stacked_layout());
 }
 
 void BrowserTabStripController::OnStartedDraggingTabs() {
@@ -570,10 +561,12 @@ void BrowserTabStripController::AddTab(WebContents* contents,
 
 void BrowserTabStripController::UpdateLayoutType() {
   bool adjust_layout = false;
-  TabStripLayoutType layout_type =
-      DetermineTabStripLayout(g_browser_process->local_state(),
-                              browser_->host_desktop_type(), &adjust_layout);
-  tabstrip_->SetLayoutType(layout_type, adjust_layout);
+  bool stacked_layout =
+      DetermineTabStripLayoutStacked(g_browser_process->local_state(),
+                                     browser_->host_desktop_type(),
+                                     &adjust_layout);
+  tabstrip_->set_adjust_layout(adjust_layout);
+  tabstrip_->SetStackedLayout(stacked_layout);
 }
 
 void BrowserTabStripController::OnFindURLMimeTypeCompleted(