Merge M51: Add base::IsOnNetworkDrive.

base/files/file_util.h

Index: base/files/file_util.h
diff --git a/base/files/file_util.h b/base/files/file_util.h
index 8f7d53c72c81020bcc0f2df7c18c88233f180524..8fd9fffeb36d044c6e169fc24f33ccdea0dec732 100644
--- a/base/files/file_util.h
+++ b/base/files/file_util.h
@@ -288,6 +288,10 @@ BASE_EXPORT bool DevicePathToDriveLetterPath(const FilePath& device_path,
 // be resolved with this function.
 BASE_EXPORT bool NormalizeToNativeFilePath(const FilePath& path,
                                            FilePath* nt_path);
+
+// Given an existing file in |path|, returns whether this file is on a network
+// drive or not. If |path| does not exist, this function returns false.
+BASE_EXPORT bool IsOnNetworkDrive(const base::FilePath& path);
 #endif
 
 // This function will return if the given file is a symlink or not.