Adds InstantExtendedEnabledParam to the search request URL iff the query extraction flag is enabled.

chrome/browser/search_engines/search_terms_data.h

 // Copyright (c) 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_ENGINES_SEARCH_TERMS_DATA_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_SEARCH_TERMS_DATA_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 43 matching lines @@
   // Returns a string that will cause the search results page to update
   // incrementally. Currently, Instant Extended passes a different param to
   // search results pages that also has this effect, so by default this function
   // returns the empty string when Instant Extended is enabled. However, when
   // doing instant search result prerendering, we still need to pass this param,
   // as Instant Extended does not cause incremental updates by default for the
   // prerender page. Callers should set |for_prerender| in this case to force
   // the returned string to be non-empty.
   virtual std::string ForceInstantResultsParam(bool for_prerender) const;
 
-  // Returns a string indicating whether InstantExtended is enabled, suitable
-  // for adding as a query string param to the homepage or search requests.
-  // Returns an empty string otherwise.  Determining this requires accessing the
-  // Profile, so this can only ever be non-empty for UIThreadSearchTermsData.
-  virtual std::string InstantExtendedEnabledParam() const;
-
   // Returns a string indicating whether a non-default theme is active,
   // suitable for adding as a query string param to the homepage.  This only
   // applies if Instant Extended is enabled.  Returns an empty string otherwise.
   // Determining this requires accessing the Profile, so this can only ever be
   // non-empty for UIThreadSearchTermsData.
   virtual std::string NTPIsThemedParam() const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SearchTermsData);
 };
 
 // Implementation of SearchTermsData that is only usable on the UI thread.
 class UIThreadSearchTermsData : public SearchTermsData {
  public:
   // If |profile_| is NULL, the Google base URL accessors will return default
-  // values, and ForceInstantResultsParam(), InstantExtendedEnabledParam(), and
-  // NTPIsThemedParam(), will return the empty string.
+  // values, and NTPIsThemedParam() will return an empty string.

[Jered, 2014/02/07 17:48:12]

Did you mean to leave out ForceInstantResultsParam()?

[kmadhusu, 2014/02/07 21:25:39]

I removed it intentionally. ForceInstantResultsParam() doesn't access Profile.
Therefore, I updated the comment. It can also be moved out of SearchTermsData. I
will do that clean up in a separate CL.

   explicit UIThreadSearchTermsData(Profile* profile);
 
   virtual std::string GoogleBaseURLValue() const OVERRIDE;
   virtual std::string GetApplicationLocale() const OVERRIDE;
   virtual base::string16 GetRlzParameterValue() const OVERRIDE;
   virtual std::string GetSearchClient() const OVERRIDE;
   virtual std::string GetSuggestClient() const OVERRIDE;
   virtual std::string GetSuggestRequestIdentifier() const OVERRIDE;
   virtual std::string ForceInstantResultsParam(
       bool for_prerender) const OVERRIDE;
-  virtual std::string InstantExtendedEnabledParam() const OVERRIDE;
   virtual std::string NTPIsThemedParam() const OVERRIDE;
 
   // Used by tests to override the value for the Google base URL.  Passing the
   // empty string cancels this override.
   static void SetGoogleBaseURL(const std::string& base_url);
 
  private:
   static std::string* google_base_url_;
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(UIThreadSearchTermsData);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_SEARCH_TERMS_DATA_H_