Use string for Histogram names since these are all ASCII anyway wide-characte...

chrome/browser/autocomplete/history_contents_provider.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/autocomplete/history_contents_provider.h"
 
 #include "base/histogram.h"
 #include "base/string_util.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/history/query_parser.h"
@@ skipping 260 matching lines @@
 
   DCHECK(results_.size() == 0);  // When we get here the results should be
                                  // empty.
 
   TimeTicks start_time = TimeTicks::Now();
   std::vector<bookmark_utils::TitleMatch> matches;
   bookmark_utils::GetBookmarksMatchingText(bookmark_model, input.text(),
                                            kMaxMatchCount, &matches);
   for (size_t i = 0; i < matches.size(); ++i)
     AddBookmarkTitleMatchToResults(matches[i]);
-  UMA_HISTOGRAM_TIMES(L"Omnibox.QueryBookmarksTime",
+  UMA_HISTOGRAM_TIMES("Omnibox.QueryBookmarksTime",
                       TimeTicks::Now() - start_time);
 }
 
 void HistoryContentsProvider::AddBookmarkTitleMatchToResults(
     const bookmark_utils::TitleMatch& match) {
   history::URLResult url_result(match.node->GetURL(), match.match_positions);
   url_result.set_title(match.node->GetTitle());
   results_.AppendURLBySwapping(&url_result);
 }