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

components/cloud_devices/common/cloud_devices_urls.cc

 // 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.
 
 #include "components/cloud_devices/common/cloud_devices_urls.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "components/cloud_devices/common/cloud_devices_switches.h"
@@ skipping 15 matching lines @@
     "http://www.google.com/landing/cloudprint/enable.html?print=true";
 
 namespace {
 
 // Url must not be matched by "urls" section of
 // cloud_print_app/manifest.json. If it's matched, print driver dialog will
 // open sign-in page in separate window.
 const char kCloudPrintURL[] = "https://www.google.com/cloudprint";
 
 const char kCloudDevicesUrl[] = "https://www.googleapis.com/clouddevices/v1";
+
 }
 
 // Returns the root service URL for the cloud print service.  The default is to
 // point at the Google Cloud Print service.  This can be overridden by the
 // command line or by the user preferences.
 GURL GetCloudPrintURL() {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   GURL cloud_print_url(
       command_line->GetSwitchValueASCII(switches::kCloudPrintURL));
   if (cloud_print_url.is_empty())
     cloud_print_url = GURL(kCloudPrintURL);
   return cloud_print_url;
 }
 
 GURL GetCloudPrintRelativeURL(const std::string& relative_path) {
   GURL url = GetCloudPrintURL();
   std::string path;
-  const char kURLPathSeparator[] = "/";
+  static const char kURLPathSeparator[] = "/";
   base::TrimString(url.path(), kURLPathSeparator, &path);
   std::string trimmed_path;
   base::TrimString(relative_path, kURLPathSeparator, &trimmed_path);
   path += kURLPathSeparator;
   path += trimmed_path;
   GURL::Replacements replacements;
   replacements.SetPathStr(path);
   return url.ReplaceComponents(replacements);
 }
 
@@ skipping 53 matching lines @@
   std::string trimmed_path;
   base::TrimString(relative_path, kURLPathSeparator, &trimmed_path);
   path += kURLPathSeparator;
   path += trimmed_path;
   GURL::Replacements replacements;
   replacements.SetPathStr(path);
   return url.ReplaceComponents(replacements);
 }
 
 }  // namespace cloud_devices