Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/io/tokenizer.h

Index: third_party/protobuf/src/google/protobuf/io/tokenizer.h
diff --git a/third_party/protobuf/src/google/protobuf/io/tokenizer.h b/third_party/protobuf/src/google/protobuf/io/tokenizer.h
index d85b82f9d22e2b89de53cd89f16e2691a86f3d75..49885eda9c6d04def8cf3e31699bfa78ddded534 100644
--- a/third_party/protobuf/src/google/protobuf/io/tokenizer.h
+++ b/third_party/protobuf/src/google/protobuf/io/tokenizer.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
@@ -40,6 +40,7 @@
 #include <string>
 #include <vector>
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
 
 namespace google {
 namespace protobuf {
@@ -67,7 +68,8 @@ class LIBPROTOBUF_EXPORT ErrorCollector {
   // Indicates that there was a warning in the input at the given line and
   // column numbers.  The numbers are zero-based, so you may want to add
   // 1 to each before printing them.
-  virtual void AddWarning(int line, int column, const string& message) { }
+  virtual void AddWarning(int /* line */, int /* column */,
+                          const string& /* message */) { }
 
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ErrorCollector);
@@ -228,6 +230,21 @@ class LIBPROTOBUF_EXPORT Tokenizer {
   // Sets the comment style.
   void set_comment_style(CommentStyle style) { comment_style_ = style; }
 
+  // Whether to require whitespace between a number and a field name.
+  // Default is true. Do not use this; for Google-internal cleanup only.
+  void set_require_space_after_number(bool require) {
+    require_space_after_number_ = require;
+  }
+
+  // Whether to allow string literals to span multiple lines. Default is false.
+  // Do not use this; for Google-internal cleanup only.
+  void set_allow_multiline_strings(bool allow) {
+    allow_multiline_strings_ = allow;
+  }
+
+  // External helper: validate an identifier.
+  static bool IsIdentifier(const string& text);
+
   // -----------------------------------------------------------------
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Tokenizer);
@@ -258,6 +275,8 @@ class LIBPROTOBUF_EXPORT Tokenizer {
   // Options.
   bool allow_f_after_float_;
   CommentStyle comment_style_;
+  bool require_space_after_number_;
+  bool allow_multiline_strings_;
 
   // Since we count columns we need to interpret tabs somehow.  We'll take
   // the standard 8-character definition for lack of any way to do better.
@@ -332,7 +351,7 @@ class LIBPROTOBUF_EXPORT Tokenizer {
 
   // -----------------------------------------------------------------
   // These helper methods make the parsing code more readable.  The
-  // "character classes" refered to are defined at the top of the .cc file.
+  // "character classes" referred to are defined at the top of the .cc file.
   // Basically it is a C++ class with one method:
   //   static bool InClass(char c);
   // The method returns true if c is a member of this "class", like "Letter"