First set of changes for M7 NTP.

chrome/browser/dom_ui/shown_sections_handler.cc

 // Copyright (c) 2010 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/dom_ui/shown_sections_handler.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
@@ skipping 71 matching lines @@
 
   if (old_mode != mode) {
     NotifySectionDisabled(mode, old_mode, dom_ui_->GetProfile());
     pref_service_->SetInteger(prefs::kNTPShownSections, mode);
   }
 }
 
 // static
 void ShownSectionsHandler::RegisterUserPrefs(PrefService* pref_service) {
   pref_service->RegisterIntegerPref(prefs::kNTPShownSections,
-                                    THUMB | RECENT | TIPS | SYNC);
+                                    THUMB | RECENT | TIPS | SYNC | APPS);
 }
 
 // static
 void ShownSectionsHandler::MigrateUserPrefs(PrefService* pref_service,
                                             int old_pref_version,
                                             int new_pref_version) {
   bool changed = false;
   int shown_sections = pref_service->GetInteger(prefs::kNTPShownSections);
 
   if (old_pref_version < 1) {
     // TIPS was used in early builds of the NNTP but since it was removed before
     // Chrome 3.0 we want to ensure that it is shown by default.
     shown_sections |= TIPS | SYNC;
     changed = true;
   }
 
   if (old_pref_version < 2) {
     // LIST is no longer used. Change to THUMB.
     shown_sections &= ~LIST;
     shown_sections |= THUMB;
     changed = true;
   }
 
+  if (old_pref_version < 3) {
+    // We reset people to only see apps by default in v3.

[Miranda Callahan, 2010/08/26 02:57:08]

Should this "only" be in this spot? Or should it be "We only reset people to see
apps by default in v3." ?

+    shown_sections = APPS;
+    changed = true;
+  }
+
   if (changed)
     pref_service->SetInteger(prefs::kNTPShownSections, shown_sections);
 }