Change uses of base::JoinString to pass StringPieces where possible.

components/password_manager/core/browser/password_ui_utils.cc

 // Copyright 2015 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/password_manager/core/browser/password_ui_utils.h"
 
 #include <algorithm>
 #include <string>
 
-#include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/common/password_form.h"
 #include "components/password_manager/core/browser/affiliation_utils.h"
 #include "components/url_formatter/elide_url.h"
 
 namespace password_manager {
 
 namespace {
 
 // The URL prefixes that are removed from shown origin.
 const char* const kRemovedPrefixes[] = {"m.", "mobile.", "www."};
 
 }  // namespace
 
 std::string SplitByDotAndReverse(base::StringPiece host) {
-  std::vector<std::string> parts =
-      base::SplitString(host, ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+  std::vector<base::StringPiece> parts = base::SplitStringPiece(
+      host, ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
   std::reverse(parts.begin(), parts.end());
   return base::JoinString(parts, ".");
 }
 
 std::string StripAndroidAndReverse(const std::string& origin) {
   const int kAndroidAppSchemeAndDelimiterLength = sizeof("android://") - 1;
   return SplitByDotAndReverse(
       base::StringPiece(&origin[kAndroidAppSchemeAndDelimiterLength],
                         origin.length() - kAndroidAppSchemeAndDelimiterLength));
 }
@@ skipping 39 matching lines @@
       result.remove_prefix(prefix.length());
       break;  // Remove only one prefix (e.g. www.mobile.de).
     }
   }
 
   return result.find('.') != base::StringPiece::npos ? result.as_string()
                                                      : original;
 }
 
 }  // namespace password_manager