IDR_THEME_TAB_BACKGROUND_INCOGNITO should not be defined on Mac.

chrome/browser/themes/browser_theme_pack_unittest.cc

Index: chrome/browser/themes/browser_theme_pack_unittest.cc
===================================================================
--- chrome/browser/themes/browser_theme_pack_unittest.cc	(revision 288488)
+++ chrome/browser/themes/browser_theme_pack_unittest.cc	(working copy)
@@ -240,7 +240,9 @@
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_FRAME_INACTIVE));
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_FRAME_INCOGNITO));
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_FRAME_INCOGNITO_INACTIVE));
+#if !defined(OS_MACOSX)
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_TAB_BACKGROUND_INCOGNITO));
+#endif
 
     // Make sure we don't have phantom data.
     EXPECT_FALSE(pack->GetColor(ThemeProperties::COLOR_CONTROL_BACKGROUND,
@@ -258,8 +260,9 @@
 
     // The high DPI theme does not define the following images:
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_TAB_BACKGROUND));
-    EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_TAB_BACKGROUND));
+#if !defined(OS_MACOSX)
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_TAB_BACKGROUND_INCOGNITO));
+#endif
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_TAB_BACKGROUND_V));
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_NTP_BACKGROUND));
     EXPECT_FALSE(pack->HasCustomImage(IDR_THEME_FRAME_OVERLAY));