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

chrome/browser/ui/browser_view_prefs.cc

Index: chrome/browser/ui/browser_view_prefs.cc
diff --git a/chrome/browser/ui/browser_view_prefs.cc b/chrome/browser/ui/browser_view_prefs.cc
index 65b2181c1842b91c5c4b921074eee2d6a0bf5111..175b0c72cc956cf24317360d661efb34190f1102 100644
--- a/chrome/browser/ui/browser_view_prefs.cc
+++ b/chrome/browser/ui/browser_view_prefs.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/browser_view_prefs.h"
 
 #include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service.h"
 #include "chrome/common/pref_names.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 
@@ -20,6 +21,11 @@ const int kDefaultPluginMessageResponseTimeout = 25000;
 // How frequently we check for hung plugin windows.
 const int kDefaultHungPluginDetectFrequency = 2000;
 
+// DEPRECATED: this is replaced by kTabStripStackedLayout and exists for
+// backwards compatibility.
+// Old values: 0 = SHRINK (default), 1 = STACKED.
+const char kTabStripLayoutType[] = "tab_strip_layout_type";
+
 }  // namespace
 
 namespace chrome {
@@ -29,6 +35,8 @@ void RegisterBrowserViewLocalPrefs(PrefRegistrySimple* registry) {
                                 kDefaultPluginMessageResponseTimeout);
   registry->RegisterIntegerPref(prefs::kHungPluginDetectFrequency,
                                 kDefaultHungPluginDetectFrequency);
+  registry->RegisterIntegerPref(kTabStripLayoutType, 0);
+  registry->RegisterBooleanPref(prefs::kTabStripStackedLayout, false);
 }
 
 void RegisterBrowserViewProfilePrefs(
@@ -44,4 +52,12 @@ void RegisterBrowserViewProfilePrefs(
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
+void MigrateBrowserTabStripPrefs(PrefService* prefs) {
+  if (prefs->HasPrefPath(kTabStripLayoutType)) {
+    prefs->SetBoolean(prefs::kTabStripStackedLayout,
+                      prefs->GetInteger(kTabStripLayoutType) != 0);
+    prefs->ClearPref(kTabStripLayoutType);
+  }
+}
+
 }  // namespace chrome