Reusing the base::StringPairs in src/components/*

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 <string>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
+#include "base/strings/string_split.h"
 
 namespace chrome {
 
 // Returns whether the Instant Extended API is enabled.
 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 EmbeddedSearchPageVersion();
 
 // Type for a collection of experiment configuration parameters.
-typedef std::vector<std::pair<std::string, std::string> > FieldTrialFlags;
+typedef base::StringPairs FieldTrialFlags;
 
 // Finds the active field trial group name and parses out the configuration
 // flags. On success, |flags| will be filled with the field trial flags. |flags|
 // must not be NULL. Returns true iff the active field trial is successfully
 // parsed and not disabled.
 // Note that |flags| may be successfully populated in some cases when false is
 // returned - in these cases it should not be used.
 // Exposed for testing only.
 bool GetFieldTrialInfo(FieldTrialFlags* flags);
 
@@ skipping 18 matching lines @@
                                     const FieldTrialFlags& flags);
 
 // Returns true if 'hide_verbatim' flag is enabled in field trials
 // to hide the top match in the native suggestions dropdown if it is a verbatim
 // match.  See comments on ShouldHideTopMatch in autocomplete_result.h.
 bool ShouldHideTopVerbatimMatch();
 
 }  // namespace chrome
 
 #endif  // COMPONENTS_SEARCH_SEARCH_H_