Fix "unreachable code" warnings (MSVC warning 4702) in chrome/browser/.

chrome/browser/prefs/incognito_mode_prefs.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/prefs/incognito_mode_prefs.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 59 matching lines @@
   return incognito_avail != IncognitoModePrefs::DISABLED &&
          (command_line.HasSwitch(switches::kIncognito) ||
           incognito_avail == IncognitoModePrefs::FORCED);
 }
 
 // static
 bool IncognitoModePrefs::CanOpenBrowser(Profile* profile) {
   switch (GetAvailability(profile->GetPrefs())) {
     case IncognitoModePrefs::ENABLED:
       return true;
+
     case IncognitoModePrefs::DISABLED:
       return !profile->IsOffTheRecord();
+
     case IncognitoModePrefs::FORCED:
       return profile->IsOffTheRecord();
-    case IncognitoModePrefs::AVAILABILITY_NUM_TYPES:
+
+    default:
       NOTREACHED();
+      return false;
   }
-  NOTREACHED();
-  return false;
 }
 
 // static
 bool IncognitoModePrefs::ArePlatformParentalControlsEnabled() {
 #if defined(OS_WIN)
   // Disable incognito mode windows if parental controls are on. This is only
   // for Windows Vista and above.
   return base::win::IsParentalControlActivityLoggingOn();
 #elif defined(OS_ANDROID)
   return chrome::android::ChromiumApplication::AreParentalControlsEnabled();
+#else
+  return false;
 #endif
-  return false;
 }