Make various string_util functions take StringPieces instead of char[].

chrome/browser/safe_browsing/safe_browsing_util.cc

 // Copyright (c) 2012 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/safe_browsing/safe_browsing_util.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/google/google_util.h"
@@ skipping 317 matching lines @@
   std::string url_unescaped_str(Unescape(url_without_fragment.spec()));
   url::Parsed parsed;
   url::ParseStandardURL(url_unescaped_str.data(), url_unescaped_str.length(),
                         &parsed);
 
   // 3. In hostname, remove all leading and trailing dots.
   const std::string host =
       (parsed.host.len > 0)
           ? url_unescaped_str.substr(parsed.host.begin, parsed.host.len)
           : std::string();
-  const char kCharsToTrim[] = ".";
   std::string host_without_end_dots;
-  base::TrimString(host, kCharsToTrim, &host_without_end_dots);
+  base::TrimString(host, ".", &host_without_end_dots);
 
   // 4. In hostname, replace consecutive dots with a single dot.
   std::string host_without_consecutive_dots(RemoveConsecutiveChars(
       host_without_end_dots, '.'));
 
   // 5. In path, replace runs of consecutive slashes with a single slash.
   std::string path =
       (parsed.path.len > 0)
           ? url_unescaped_str.substr(parsed.path.begin, parsed.path.len)
           : std::string();
@@ skipping 177 matching lines @@
   memcpy(hash_out.full_hash, hash_in.data(), crypto::kSHA256Length);
   return hash_out;
 }
 
 std::string SBFullHashToString(const SBFullHash& hash) {
   DCHECK_EQ(crypto::kSHA256Length, sizeof(hash.full_hash));
   return std::string(hash.full_hash, sizeof(hash.full_hash));
 }
 
 }  // namespace safe_browsing_util