Make chrome/browser/chrome_browser_main_linux.* Linux-only.

chrome/browser/chrome_browser_main_posix.cc

Index: chrome/browser/chrome_browser_main_posix.cc
===================================================================
--- chrome/browser/chrome_browser_main_posix.cc	(revision 128430)
+++ chrome/browser/chrome_browser_main_posix.cc	(working copy)
@@ -27,6 +27,7 @@
 #endif
 
 #if defined(TOOLKIT_USES_GTK)
+#include "chrome/browser/chrome_browser_main_extra_parts_gtk.h"
 #include "chrome/browser/printing/print_dialog_gtk.h"
 #endif
 
@@ -272,3 +273,22 @@
       &PrintDialogGtk::CreatePrintDialog);
 #endif
 }
+
+void ChromeBrowserMainPartsPosix::ShowMissingLocaleMessageBox() {
+#if defined(OS_CHROMEOS)
+  NOTREACHED();  // Should not ever happen on ChromeOS.
+#elif defined(OS_ANDROID)
+  // TODO(port) Update this as needed.
+  // Probably should not ever happen on Android, but at the time of this
+  // writing, Android isn't even using ChromeBrowserMainPartsPosix yet.
+  NOTREACHED();
+#elif defined(OS_MACOSX)
+  // Not called on Mac because we load the locale files differently.
+  NOTREACHED();
+#elif defined(TOOLKIT_USES_GTK)
+  ChromeBrowserMainExtraPartsGtk::ShowMessageBox(
+      chrome_browser::kMissingLocaleDataMessage);
+#else
+#error "Need MessageBox implementation."
+#endif
+}