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

chrome/browser/browser_main.h

Index: chrome/browser/browser_main.h
diff --git a/chrome/browser/browser_main.h b/chrome/browser/browser_main.h
index 80b960254b3710865fdf22c46d052e58c541e51b..a663a3947943d3ba7d641b00727af17224a690bb 100644
--- a/chrome/browser/browser_main.h
+++ b/chrome/browser/browser_main.h
@@ -30,6 +30,12 @@ namespace net {
 class NetworkChangeNotifier;
 }
 
+namespace chrome_browser {
+// For use by ShowMissingLocaleMessageBox.
+extern const char kMissingLocaleDataTitle[];
+extern const char kMissingLocaleDataMessage[];
+}
+
 // BrowserMainParts:
 // This class contains different "stages" to be executed in |BrowserMain()|,
 // mostly initialization. This is made into a class rather than just functions
@@ -201,6 +207,9 @@ void RecordBreakpadStatusUMA(MetricsService* metrics);
 // present on the current platform.
 void WarnAboutMinimumSystemRequirements();
 
+// Displays a warning message that we can't find any locale data files.
+void ShowMissingLocaleMessageBox();
+
 // Records the time from our process' startup to the present time in
 // the UMA histogram |metric_name|.
 void RecordBrowserStartupTime();