Update //third_party/protobuf to version 3.

third_party/protobuf/editors/proto.vim

+" Protocol Buffers - Google's data interchange format
+" Copyright 2008 Google Inc.  All rights reserved.
+" 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
+" met:
+"
+"     * Redistributions of source code must retain the above copyright
+" notice, this list of conditions and the following disclaimer.
+"     * Redistributions in binary form must reproduce the above
+" copyright notice, this list of conditions and the following disclaimer
+" in the documentation and/or other materials provided with the
+" distribution.
+"     * Neither the name of Google Inc. nor the names of its
+" contributors may be used to endorse or promote products derived from
+" this software without specific prior written permission.
+"
+" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+" OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+" This is the Vim syntax file for Google Protocol Buffers.
+"
+" Usage:
+"
+" 1. cp proto.vim ~/.vim/syntax/
+" 2. Add the following to ~/.vimrc:
+"
+" augroup filetype
+"   au! BufRead,BufNewFile *.proto setfiletype proto
+" augroup end
+"
+" Or just create a new file called ~/.vim/ftdetect/proto.vim with the
+" previous lines on it.
+
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+syn case match
+
+syn keyword pbTodo       contained TODO FIXME XXX
+syn cluster pbCommentGrp contains=pbTodo
+
+syn keyword pbSyntax     syntax import option
+syn keyword pbStructure  package message group oneof
+syn keyword pbRepeat     optional required repeated
+syn keyword pbDefault    default
+syn keyword pbExtend     extend extensions to max reserved
+syn keyword pbRPC        service rpc returns
+
+syn keyword pbType      int32 int64 uint32 uint64 sint32 sint64
+syn keyword pbType      fixed32 fixed64 sfixed32 sfixed64
+syn keyword pbType      float double bool string bytes
+syn keyword pbTypedef   enum
+syn keyword pbBool      true false
+
+syn match   pbInt     /-\?\<\d\+\>/
+syn match   pbInt     /\<0[xX]\x+\>/
+syn match   pbFloat   /\<-\?\d*\(\.\d*\)\?/
+syn region  pbComment start="\/\*" end="\*\/" contains=@pbCommentGrp
+syn region  pbComment start="//" skip="\\$" end="$" keepend contains=@pbCommentGrp
+syn region  pbString  start=/"/ skip=/\\./ end=/"/
+syn region  pbString  start=/'/ skip=/\\./ end=/'/
+
+if version >= 508 || !exists("did_proto_syn_inits")
+  if version < 508
+    let did_proto_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  HiLink pbTodo         Todo
+
+  HiLink pbSyntax       Include
+  HiLink pbStructure    Structure
+  HiLink pbRepeat       Repeat
+  HiLink pbDefault      Keyword
+  HiLink pbExtend       Keyword
+  HiLink pbRPC          Keyword
+  HiLink pbType         Type
+  HiLink pbTypedef      Typedef
+  HiLink pbBool         Boolean
+
+  HiLink pbInt          Number
+  HiLink pbFloat        Float
+  HiLink pbComment      Comment
+  HiLink pbString       String
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "proto"