Instant cleanup: Remove abandoned EmbeddedSearch Android-only field trials

components/search/search.h

 // Copyright 2014 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 COMPONENTS_SEARCH_SEARCH_H_
 #define COMPONENTS_SEARCH_SEARCH_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/strings/string_split.h"
 
 class GURL;
 class TemplateURL;
 
 namespace search {
 
-// Returns whether the Instant Extended API is enabled.
+// Returns whether the Instant Extended API is enabled. This is always true on
+// desktop and false on mobile.
 bool IsInstantExtendedAPIEnabled();
 
 // Returns the value to pass to the &espv CGI parameter when loading the
 // embedded search page from the user's default search provider. Returns 0 if
 // the Instant Extended API is not enabled.
 uint64_t EmbeddedSearchPageVersion();
 
 // Type for a collection of experiment configuration parameters.
 typedef base::StringPairs FieldTrialFlags;
 
@@ skipping 33 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.
 std::string ForceInstantResultsParam(bool for_prerender);
 
-// Returns true if 'prefetch_results' flag is set to true in field trials to
-// prefetch high-confidence search suggestions.
+// Returns whether to prefetch high-confidence search suggestions. True iff
+// the Instant Extended API is enabled.
 bool ShouldPrefetchSearchResults();
 
-// Returns true if 'reuse_instant_search_base_page' flag is set to true in field
-// trials to reuse the prerendered page to commit any search query.
+// Returns whether to reuse the prerendered page to commit any search query.
+// True iff the Instant Extended API is enabled.
 bool ShouldReuseInstantSearchBasePage();
 
 // |url| should either have a secure scheme or have a non-HTTPS base URL that
 // the user specified using --google-base-url. (This allows testers to use
 // --google-base-url to point at non-HTTPS servers, which eases testing.)
 bool IsSuitableURLForInstant(const GURL& url, const TemplateURL* template_url);
 
 }  // namespace search
 
 #endif  // COMPONENTS_SEARCH_SEARCH_H_