Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.cc

Index: third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
diff --git a/third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.cc b/third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
index b3a71ce31d104003f32a9b2977c963b4f84797b3..686e63f2528a3509d601cebdcece3aa4d144d431 100644
--- a/third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
+++ b/third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
@@ -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
@@ -33,10 +33,14 @@
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
 #include <google/protobuf/io/zero_copy_stream_impl_lite.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/stl_util.h>
 
 #include <algorithm>
+#include <limits>
+
+#include <google/protobuf/stubs/casts.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/stl_util.h>
 
 namespace google {
 namespace protobuf {
@@ -161,15 +165,23 @@ bool StringOutputStream::Next(void** data, int* size) {
     // without a memory allocation this way.
     STLStringResizeUninitialized(target_, target_->capacity());
   } else {
-    // Size has reached capacity, so double the size.  Also make sure
-    // that the new size is at least kMinimumSize.
+    // Size has reached capacity, try to double the size.
+    if (old_size > std::numeric_limits<int>::max() / 2) {
+      // Can not double the size otherwise it is going to cause integer
+      // overflow in the expression below: old_size * 2 ";
+      GOOGLE_LOG(ERROR) << "Cannot allocate buffer larger than kint32max for "
+                 << "StringOutputStream.";
+      return false;
+    }
+    // Double the size, also make sure that the new size is at least
+    // kMinimumSize.
     STLStringResizeUninitialized(
       target_,
       max(old_size * 2,
           kMinimumSize + 0));  // "+ 0" works around GCC4 weirdness.
   }
 
-  *data = string_as_array(target_) + old_size;
+  *data = mutable_string_data(target_) + old_size;
   *size = target_->size() - old_size;
   return true;
 }