Remove is_win/OS_WIN checks in shell code

shell/application_manager/local_fetcher.cc

Index: shell/application_manager/local_fetcher.cc
diff --git a/shell/application_manager/local_fetcher.cc b/shell/application_manager/local_fetcher.cc
index 9d23613e3b9fcddd61fefd98aa3233d824acbc1d..d9f2b6a460e84f7f73a8fb0782a3034303642dba 100644
--- a/shell/application_manager/local_fetcher.cc
+++ b/shell/application_manager/local_fetcher.cc
@@ -40,13 +40,7 @@ base::FilePath LocalFetcher::UrlToFile(const GURL& url) {
   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 {