If no locale data files can be found, show a dialog and exit

chrome/browser/browser_main.cc

Index: chrome/browser/browser_main.cc
diff --git a/chrome/browser/browser_main.cc b/chrome/browser/browser_main.cc
index 3dec4f48adfd30a41daa04a6550d9f0d56c82bae..8f8de73fd61cc86ed6b9ca8db8d1ea90e51058f6 100644
--- a/chrome/browser/browser_main.cc
+++ b/chrome/browser/browser_main.cc
@@ -1469,6 +1469,16 @@ int BrowserMain(const MainFunctionParams& parameters) {
     // method InitSharedInstance is ignored.
     const std::string loaded_locale =
         ResourceBundle::InitSharedInstance(locale);
+    if (loaded_locale.empty() &&
+        !parsed_command_line.HasSwitch(switches::kNoErrorDialogs)) {
+      // This error message is not localized because we failed to load the
+      // localization data files.
+      const char* message =
+          "Unable to find locale data files. Please reinstall.";
+      const char* title = "Missing File Error";
+      ShowMissingLocaleMessageBox(message, title);
+      return chrome::RESULT_CODE_MISSING_DATA;
+    }
     CHECK(!loaded_locale.empty()) << "Locale could not be found for " << locale;
     g_browser_process->SetApplicationLocale(loaded_locale);