Guest session operates irrespective of IncognitoModePrefs

Sanity DCHECK for IncognitoModePrefs skipped for guest profile.

BUG=395044

Review URL: https://codereview.chromium.org/496713003

Cr-Commit-Position: refs/heads/master@{#291425}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291425 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/prefs/incognito_mode_prefs.cc

@@ -82,6 +82,9 @@ bool IncognitoModePrefs::ShouldLaunchIncognito(
 
 // static
 bool IncognitoModePrefs::CanOpenBrowser(Profile* profile) {
+  if (profile->IsGuestSession())
+    return true;
+
   switch (GetAvailability(profile->GetPrefs())) {
     case IncognitoModePrefs::ENABLED:
       return true;

chrome/browser/profiles/off_the_record_profile_impl.cc

@@ -124,8 +124,10 @@ void OffTheRecordProfileImpl::Init() {
   BrowserContextDependencyManager::GetInstance()->CreateBrowserContextServices(
       this);
 
-  DCHECK_NE(IncognitoModePrefs::DISABLED,
-            IncognitoModePrefs::GetAvailability(profile_->GetPrefs()));
+  // Guest profiles may always be OTR. Check IncognitoModePrefs otherwise.
+  DCHECK(profile_->IsGuestSession() ||
+         IncognitoModePrefs::GetAvailability(profile_->GetPrefs()) !=
+             IncognitoModePrefs::DISABLED);
 
 #if defined(OS_ANDROID) || defined(OS_IOS)
   UseSystemProxy();