Change ThemeService to handle uninstalled themes.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index fac49f28d5d64d1bae52185f2c766a52f764ca9a..c34ff6d884b116c26ce404b198f0b2107a352820 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -1168,6 +1168,14 @@ void ExtensionService::NotifyExtensionUnloaded(
       content::Source<Profile>(profile_),
       content::Details<UnloadedExtensionInfo>(&details));
 
+#if defined(ENABLE_THEMES)
+  // Let the ThemeService know that the theme has been unloaded.
+  if (reason != extension_misc::UNLOAD_REASON_UPDATE &&
+      extension->id() == ThemeService::GetThemeIDForProfile(profile_)) {
+    ThemeServiceFactory::GetForProfile(profile_)->UseDefaultTheme();
+  }
+#endif
+
   for (content::RenderProcessHost::iterator i(
           content::RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance()) {