Escape backslash (\x5C) for string value of search query.

chrome/browser/google_apis/drive_api_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/google_apis/drive_api_util.h"
 
 #include "base/command_line.h"
 #include "base/string_util.h"
 #include "chrome/browser/google_apis/drive_switches.h"
 
 namespace google_apis {
 namespace util {
 
 bool IsDriveV2ApiEnabled() {
   return CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableDriveV2Api);
 }
 
 }  // namespace util
 
 namespace drive {
 namespace util {
 
 std::string EscapeQueryStringValue(const std::string& str) {
   std::string result;
-  ReplaceChars(str, "'", "\\'", &result);
+  result.reserve(str.size());
+  for (size_t i = 0; i < str.size(); ++i) {
+    if (str[i] == '\\' || str[i] == '\'') {
+      result.push_back('\\');
+    }
+    result.push_back(str[i]);
+  }
   return result;
 }
 
 }  // namespace util
 }  // namespace drive
 }  // namespace google_apis