Replace string::find(prefix) == 0 pattern with base::StartsWith().

net/base/filename_util.cc

 // Copyright 2014 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/base/filename_util.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
@@ skipping 156 matching lines @@
   std::string filename_lower = base::ToLowerASCII(base::WideToUTF8(filename));
 #elif defined(OS_POSIX)
   std::string filename_lower = base::ToLowerASCII(filename);
 #endif
 
   for (size_t i = 0; i < arraysize(known_devices); ++i) {
     // Exact match.
     if (filename_lower == known_devices[i])
       return true;
     // Starts with "DEVICE.".
-    if (filename_lower.find(std::string(known_devices[i]) + ".") == 0)
+    if (base::StartsWith(filename_lower, std::string(known_devices[i]) + ".",
+                         base::CompareCase::SENSITIVE)) {
       return true;
+    }
   }
 
   static const char* const magic_names[] = {
       // These file names are used by the "Customize folder" feature of the
       // shell.
       "desktop.ini",
       "thumbs.db",
   };
 
   for (size_t i = 0; i < arraysize(magic_names); ++i) {
     if (filename_lower == magic_names[i])
       return true;
   }
 
   return false;
 }
 
 }  // namespace net