[MD] Change appearance of incognito NTP to MD spec.

chrome/browser/ui/webui/theme_source.cc

Index: chrome/browser/ui/webui/theme_source.cc
diff --git a/chrome/browser/ui/webui/theme_source.cc b/chrome/browser/ui/webui/theme_source.cc
index a1efb62425cde2f72c44fc9e4ebb42614bc10600..6ea356924d9b275eccf7be1839e58fde8e21cb61 100644
--- a/chrome/browser/ui/webui/theme_source.cc
+++ b/chrome/browser/ui/webui/theme_source.cc
@@ -68,8 +68,9 @@ void ProcessResourceOnUIThread(int resource_id,
 
 ThemeSource::ThemeSource(Profile* profile)
     : profile_(profile->GetOriginalProfile()) {
+  // NB: it's important that this is |profile| and not |profile_|.
   NTPResourceCache::WindowType win_type = NTPResourceCache::GetWindowType(
-      profile_, NULL);
+      profile, NULL);
   css_bytes_ =
       NTPResourceCacheFactory::GetForProfile(profile)->GetNewTabCSS(win_type);
 }