browser: Extract AutocompleteProvider from autocomplete.*

This is the first part of splitting autocomplete.* into small pieces, one for
each class.

BUG=94842
R=pkasting@chromium.org
TBR=sky@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10663015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@144107 0039d316-1c4b-4281-b951-d872f2087c98
void AppendAvailableAutocompletion(int type,
                                   int count,
                                   std::string* autocompletions) {
  if (!autocompletions->empty())
    autocompletions->append("j");
  base::StringAppendF(autocompletions, "%d", type);
  if (count > 1)
    base::StringAppendF(autocompletions, "l%d", count);
}

void AppendAvailableAutocompletion(int type,
                                   int count,
                                   std::string* autocompletions) {
  if (!autocompletions->empty())
    autocompletions->append("j");
  base::StringAppendF(autocompletions, "%d", type);
  if (count > 1)
    base::StringAppendF(autocompletions, "l%d", count);
}
