Pull protocolbuffers/protobuf@92a7e77

This CL updates src/third_party/protobuf as follows:
  from: protocolbuffers/protobuf@c44ca26
    to: protocolbuffers/protobuf@92a7e77

BUG=
TEST=runtests

src/data/version/mozc_version_template.bzl

@@ -30,7 +30,7 @@
 
 MAJOR=2
 MINOR=23
-BUILD=2780
+BUILD=2781
 REVISION=102
 # This version represents the version of Mozc IME engine (converter, predictor,
 # etc.).  This version info is included both in the Mozc server and in the Mozc

src/protobuf/protobuf.gyp

@@ -52,6 +52,18 @@
       '4800',
     ],
 
+    # We accept following warnings come from protobuf header files.
+    # This list should be revised when protobuf is updated.
+    'msvc_disabled_warnings_for_proto_headers': [
+      # unary minus operator applied to unsigned type, result still unsigned.
+      # http://msdn.microsoft.com/en-us/library/4kh09110.aspx
+      '4146',
+      # 'type' : forcing value to bool 'true' or 'false'
+      # (performance warning)
+      # http://msdn.microsoft.com/en-us/library/b6801kcy.aspx
+      '4800',
+    ],
+
     'protobuf_prebuilt_jar_path': '',
 
     'protobuf_cpp_root': '<(protobuf_root)/src/google/protobuf',
@@ -70,6 +82,7 @@
       '<(protobuf_cpp_root)/extension_set_heavy.cc',
       '<(protobuf_cpp_root)/generated_message_reflection.cc',
       '<(protobuf_cpp_root)/generated_message_util.cc',
+      '<(protobuf_cpp_root)/implicit_weak_message.cc',
       '<(protobuf_cpp_root)/io/coded_stream.cc',
       '<(protobuf_cpp_root)/io/gzip_stream.cc',
       '<(protobuf_cpp_root)/io/printer.cc',
@@ -95,6 +108,7 @@
       '<(protobuf_cpp_root)/stubs/structurally_valid.cc',
       '<(protobuf_cpp_root)/stubs/strutil.cc',
       '<(protobuf_cpp_root)/stubs/substitute.cc',
+      '<(protobuf_cpp_root)/stubs/io_win32.cc',
       '<(protobuf_cpp_root)/text_format.cc',
       '<(protobuf_cpp_root)/unknown_field_set.cc',
       '<(protobuf_cpp_root)/wire_format.cc',
@@ -117,6 +131,7 @@
       '<(protobuf_cpp_root)/compiler/cpp/cpp_map_field.cc',
       '<(protobuf_cpp_root)/compiler/cpp/cpp_message.cc',
       '<(protobuf_cpp_root)/compiler/cpp/cpp_message_field.cc',
+      '<(protobuf_cpp_root)/compiler/cpp/cpp_padding_optimizer.cc',
       '<(protobuf_cpp_root)/compiler/cpp/cpp_primitive_field.cc',
       '<(protobuf_cpp_root)/compiler/cpp/cpp_service.cc',
       '<(protobuf_cpp_root)/compiler/cpp/cpp_string_field.cc',
@@ -198,6 +213,9 @@
             'include_dirs': [
               '<(protobuf_root)/src',
             ],
+            'msvs_disabled_warnings': [
+              '<@(msvc_disabled_warnings_for_proto_headers)',
+            ],
           },
           'msvs_disabled_warnings': [
             '<@(msvc_disabled_warnings_for_protoc)',