Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/testing/file.h

Index: third_party/protobuf/src/google/protobuf/testing/file.h
diff --git a/third_party/protobuf/src/google/protobuf/testing/file.h b/third_party/protobuf/src/google/protobuf/testing/file.h
index a6b1c7641f2f6a2ec582804b8b152043b149b57f..2f63f80e7b2946134184641a1643518d91221103 100644
--- a/third_party/protobuf/src/google/protobuf/testing/file.h
+++ b/third_party/protobuf/src/google/protobuf/testing/file.h
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -56,6 +56,10 @@ class File {
   static void ReadFileToStringOrDie(const string& name, string* output);
 
   // Create a file and write a string to it.
+  static bool WriteStringToFile(const string& contents,
+                                const string& name);
+
+  // Same as above, but crash on failure.
   static void WriteStringToFileOrDie(const string& contents,
                                      const string& name);
 
@@ -73,6 +77,19 @@ class File {
   static void DeleteRecursively(const string& name,
                                 void* dummy1, void* dummy2);
 
+  // Change working directory to given directory.
+  static bool ChangeWorkingDirectory(const string& new_working_directory);
+
+  static bool GetContents(
+      const string& name, string* output, bool /*is_default*/) {
+    return ReadFileToString(name, output);
+  }
+
+  static bool SetContents(
+      const string& name, const string& contents, bool /*is_default*/) {
+    return WriteStringToFile(contents, name);
+  }
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(File);
 };