Remove is_win/OS_WIN checks in shell code

shell/application_manager/local_fetcher.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 "shell/application_manager/local_fetcher.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/format_macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 22 matching lines @@
   TRACE_EVENT1("mojo_shell", "LocalFetcher::LocalFetcher", "url", url.spec());
   loader_callback_.Run(make_scoped_ptr(this));
 }
 
 base::FilePath LocalFetcher::UrlToFile(const GURL& url) {
   DCHECK(url.SchemeIsFile());
   url::RawCanonOutputW<1024> output;
   url::DecodeURLEscapeSequences(url.path().data(),
                                 static_cast<int>(url.path().length()), &output);
   base::string16 decoded_path = base::string16(output.data(), output.length());
-#if defined(OS_WIN)
-  base::TrimString(decoded_path, L"/", &decoded_path);
-  base::FilePath path(decoded_path);
-#else
-  base::FilePath path(base::UTF16ToUTF8(decoded_path));
-#endif
-  return path;
+  return base::FilePath(base::UTF16ToUTF8(decoded_path));
 }
 
 const GURL& LocalFetcher::GetURL() const {
   return url_;
 }
 
 GURL LocalFetcher::GetRedirectURL() const {
   return GURL::EmptyGURL();
 }
 
@@ skipping 37 matching lines @@
   ReadFileToString(path_, &start_of_file, kMaxShebangLength);
   size_t return_position = start_of_file.find('\n');
   if (return_position == std::string::npos)
     return false;
   *line = start_of_file.substr(0, return_position + 1);
   return true;
 }
 
 }  // namespace shell
 }  // namespace mojo