Fixed app launcher crashing trying to load guest profile.

chrome/browser/ui/app_list/app_list_service_impl.cc

Index: chrome/browser/ui/app_list/app_list_service_impl.cc
diff --git a/chrome/browser/ui/app_list/app_list_service_impl.cc b/chrome/browser/ui/app_list/app_list_service_impl.cc
index 57397697e8fd66d3db61fcb57c1763253a74ae02..67636fce338dbed53b6cd411de20d0f36d21536a 100644
--- a/chrome/browser/ui/app_list/app_list_service_impl.cc
+++ b/chrome/browser/ui/app_list/app_list_service_impl.cc
@@ -206,6 +206,16 @@ void RecordAppListDiscoverability(PrefService* local_state,
                             AppListService::ENABLE_NUM_ENABLE_SOURCES);
 }
 
+// Checks whether a profile name is valid for the app list. Returns false if the
+// name is empty, or represents a guest profile.
+bool IsValidProfileName(const std::string& profile_name) {
+  if (profile_name.empty())
+    return false;
+
+  return profile_name !=
+         base::FilePath(chrome::kGuestProfileDir).AsUTF8Unsafe();
+}
+
 }  // namespace
 
 void AppListServiceImpl::RecordAppListLaunch() {
@@ -291,13 +301,13 @@ base::FilePath AppListServiceImpl::GetProfilePath(
 
   // If the user has no profile preference for the app launcher, default to the
   // last browser profile used.
-  if (app_list_profile.empty() &&
+  if (!IsValidProfileName(app_list_profile) &&
       local_state_->HasPrefPath(prefs::kProfileLastUsed)) {
     app_list_profile = local_state_->GetString(prefs::kProfileLastUsed);
   }
 
   // If there is no last used profile recorded, use the initial profile.
-  if (app_list_profile.empty())
+  if (!IsValidProfileName(app_list_profile))
     app_list_profile = chrome::kInitialProfile;
 
   return user_data_dir.AppendASCII(app_list_profile);