Cleanup: Remove unused variables in chrome/ found by Scythe.

chrome/browser/ui/search/instant_page.cc

Index: chrome/browser/ui/search/instant_page.cc
diff --git a/chrome/browser/ui/search/instant_page.cc b/chrome/browser/ui/search/instant_page.cc
index 3b412ac36ea9ca44f8b1dd242b50317f512be0c7..53fc718bfb77f1ae0edfa05aa2e5e66fa263c19b 100644
--- a/chrome/browser/ui/search/instant_page.cc
+++ b/chrome/browser/ui/search/instant_page.cc
@@ -43,12 +43,12 @@ bool InstantPage::IsLocal() const {
       web_contents()->GetURL() == GURL(chrome::kChromeSearchLocalNtpUrl);
 }
 
-InstantPage::InstantPage(Delegate* delegate, const std::string& instant_url,
-                         Profile* profile, bool is_incognito)
+InstantPage::InstantPage(Delegate* delegate,
+                         const std::string& instant_url,
+                         Profile* profile)
     : profile_(profile),
       delegate_(delegate),
-      instant_url_(instant_url),
-      is_incognito_(is_incognito) {
+      instant_url_(instant_url) {
 }
 
 void InstantPage::SetContents(content::WebContents* new_web_contents) {