resources: Prevent including the same resource in multiple pack files.

ash/test/test_suite.cc

Index: ash/test/test_suite.cc
diff --git a/ash/test/test_suite.cc b/ash/test/test_suite.cc
index d368a2120a2c90fe349148b40039b59ed7b3fe66..a883d595fecc925d947e79078eaa83aa4564716f 100644
--- a/ash/test/test_suite.cc
+++ b/ash/test/test_suite.cc
@@ -14,6 +14,10 @@
 #include "ui/gfx/gfx_paths.h"
 #include "ui/gl/gl_surface.h"
 
+#if defined(OS_CHROMEOS)
+#include "ui/keyboard/keyboard.h"
+#endif
+
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
 #include "ui/base/win/atl_module.h"
@@ -61,6 +65,9 @@ void AuraShellTestSuite::Initialize() {
 }
 
 void AuraShellTestSuite::Shutdown() {
+#if defined(OS_CHROMEOS)
+  keyboard::ResetKeyboardForTesting();
+#endif
   ui::ResourceBundle::CleanupSharedInstance();
 #if defined(OS_WIN)
   com_initializer_.reset();