Introduces a search term extraction mechanism working for arbitrary search providers.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 62f3a03471f5ce0a9d2cd4d05d23a06a2856b233..a8fc7f60998eda93351b7834de344e04b5b3d0e8 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -403,6 +403,10 @@ const char kDefaultSearchProviderID[] = "default_search_provider.id";
 const char kDefaultSearchProviderPrepopulateID[] =
     "default_search_provider.prepopulate_id";
 
+// The alternate urls of the default search provider.
+const char kDefaultSearchProviderAlternateURLs[] =
+    "default_search_provider.alternate_urls";
+
 // The dictionary key used when the default search providers are given
 // in the preferences file. Normally they are copied from the master
 // preferences file.