Moving away from shell api to support long path names on windows for filesystem.

base/file_path.cc

Index: base/file_path.cc
===================================================================
--- base/file_path.cc	(revision 68690)
+++ base/file_path.cc	(working copy)
@@ -34,6 +34,11 @@
 const FilePath::CharType FilePath::kCurrentDirectory[] = FILE_PATH_LITERAL(".");
 const FilePath::CharType FilePath::kParentDirectory[] = FILE_PATH_LITERAL("..");
 
+#if defined(OS_WIN)
+const FilePath::CharType FilePath::kExtendedPathPrefix[] = FILE_PATH_LITERAL(
+    "\\\\?\\");
+#endif
+
 const FilePath::CharType FilePath::kExtensionSeparator = FILE_PATH_LITERAL('.');
 
 typedef FilePath::StringType StringType;
@@ -1190,3 +1195,9 @@
   return FilePath(copy);
 }
 #endif
+
+#if defined(OS_WIN)
+bool FilePath::StartsWithExtendedPathPrefix() const {
+  return StartsWith(path_, kExtendedPathPrefix, false);
+}
+#endif