linux and chromeos: Turn on -Wunused-const-variable.

chrome/browser/chromeos/login/wallpaper_manager_unittest.cc

Index: chrome/browser/chromeos/login/wallpaper_manager_unittest.cc
diff --git a/chrome/browser/chromeos/login/wallpaper_manager_unittest.cc b/chrome/browser/chromeos/login/wallpaper_manager_unittest.cc
index 0e3e7a8504c0d495e3aec37219ee3d1479f4c22b..8f3391baa7b6b1e0bb5e0211572c106c11651d10 100644
--- a/chrome/browser/chromeos/login/wallpaper_manager_unittest.cc
+++ b/chrome/browser/chromeos/login/wallpaper_manager_unittest.cc
@@ -30,16 +30,9 @@
 
 using namespace ash;
 
-namespace {
-
 const char kTestUser1[] = "test-user@example.com";
 const char kTestUser1Hash[] = "test-user@example.com-hash";
 
-const int kLargeWallpaperResourceId = IDR_AURA_WALLPAPER_DEFAULT_LARGE;
-const int kSmallWallpaperResourceId = IDR_AURA_WALLPAPER_DEFAULT_SMALL;
-
-}  // namespace
-
 namespace chromeos {
 
 class WallpaperManagerTest : public test::AshTestBase {