InstantExtended: Remove overlay control code.

chrome/browser/search/search.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SEARCH_SEARCH_H_
 #define CHROME_BROWSER_SEARCH_SEARCH_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 150 matching lines @@
 // If the input is already a privileged URL then that same URL is returned.
 GURL GetPrivilegedURLForInstant(const GURL& url, Profile* profile);
 
 // Returns true if the input |url| is a privileged Instant URL.
 bool IsPrivilegedURLForInstant(const GURL& url);
 
 // Returns the staleness timeout (in seconds) that should be used to refresh the
 // InstantLoader.
 int GetInstantLoaderStalenessTimeoutSec();
 
-// Returns true if |contents| corresponds to an Instant overlay.
-bool IsInstantOverlay(const content::WebContents* contents);
-
 // Returns true if |contents| corresponds to a preloaded instant extended NTP.
 bool IsPreloadedInstantExtendedNTP(const content::WebContents* contents);
 
 // -----------------------------------------------------
 // The following APIs are exposed for use in tests only.
 // -----------------------------------------------------
 
 // Forces the Instant Extended API to be enabled for tests.
 void EnableInstantExtendedAPIForTesting();
 
@@ skipping 38 matching lines @@
 // template. Exposed for testing only.
 bool DefaultSearchProviderSupportsInstant(Profile* profile);
 
 // Let tests reset the gate that prevents metrics from being sent more than
 // once.
 void ResetInstantExtendedOptInStateGateForTest();
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_SEARCH_SEARCH_H_