Fix 15 coverity complaints....

net/disk_cache/mapped_file_win.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 "net/disk_cache/mapped_file.h"
 
 #include "base/logging.h"
 #include "net/disk_cache/disk_cache.h"
 
 namespace disk_cache {
 
-void* MappedFile::Init(const std::wstring name, size_t size) {
+void* MappedFile::Init(const std::wstring& name, size_t size) {
   DCHECK(!init_);
   if (init_ || !File::Init(name))
     return NULL;
 
   buffer_ = NULL;
   init_ = true;
   section_ = CreateFileMapping(platform_file(), NULL, PAGE_READWRITE, 0,
                                static_cast<DWORD>(size), NULL);
   if (!section_)
     return NULL;
@@ skipping 22 matching lines @@
   size_t offset = block->offset() + view_size_;
   return Read(block->buffer(), block->size(), offset);
 }
 
 bool MappedFile::Store(const FileBlock* block) {
   size_t offset = block->offset() + view_size_;
   return Write(block->buffer(), block->size(), offset);
 }
 
 }  // namespace disk_cache