alternate ntp: persist show-search-provider-logo option at chrome://instant

chrome/browser/ui/webui/instant_ui.h

Index: chrome/browser/ui/webui/instant_ui.h
diff --git a/chrome/browser/ui/webui/instant_ui.h b/chrome/browser/ui/webui/instant_ui.h
index 32ac0643ff17e683ea1db49dcad540ac6aa1466d..fac71a44da7afcca0cd66e047a698d3a40734ca1 100644
--- a/chrome/browser/ui/webui/instant_ui.h
+++ b/chrome/browser/ui/webui/instant_ui.h
@@ -7,6 +7,12 @@
 
 #include "content/public/browser/web_ui_controller.h"
 
+class PrefService;
+
+namespace content {
+class BrowserContext;
+}
+
 // Provides configuration options for Instant web search.
 class InstantUI : public content::WebUIController {
  public:
@@ -18,7 +24,10 @@ class InstantUI : public content::WebUIController {
   static int GetSlowAnimationScaleFactor();
 
   // Returns true if search provider logo should be shown.
-  static bool ShouldShowSearchProviderLogo();
+  static bool ShouldShowSearchProviderLogo(
+      content::BrowserContext* browser_context);
+
+  static void RegisterUserPrefs(PrefService* user_prefs);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstantUI);