Use explicit WebString <-> string16 conversion methods in storage API files

third_party/WebKit/Source/platform/exported/FilePathConversion.cpp

 // Copyright 2016 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 "public/platform/FilePathConversion.h"
 
 #include "base/files/file_path.h"
 #include "public/platform/WebString.h"
 #include "wtf/text/StringUTF8Adaptor.h"
 #include "wtf/text/WTFString.h"
@@ skipping 13 matching lines @@
 #if OS(POSIX)
   StringUTF8Adaptor utf8(str);
   return base::FilePath::FromUTF8Unsafe(utf8.asStringPiece());
 #else
   const LChar* data8 = str.characters8();
   return base::FilePath::FromUTF16Unsafe(
       base::string16(data8, data8 + str.length()));
 #endif
 }
 
+WebString FilePathToWebString(const base::FilePath& path) {
+  if (path.empty())
+    return WebString();
+
+#if OS(POSIX)
+  return WebString::fromUTF8(path.value());
+#else
+  return WebString::fromUTF16(path.AsUTF16Unsafe());
+#endif
+}
+
 }  // namespace blink