Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/README.chromium

 Name: Protocol Buffers
 Short Name: protobuf
 URL: https://github.com/google/protobuf
 License: BSD
 License File: LICENSE
-Version: 3.0.0-beta-2
-Revision: d5fb408ddc281ffcadeb08699e65bb694656d0bd
+Version: 3.0.0-beta-3
+Revision: 3470b6895aa659b7559ed678e029a5338e535f14
 Security Critical: yes
 
 Steps used to create the current version:
 1. Pull the release from https://github.com/google/protobuf/releases
-2. Use the cleanup_release.sh script to remove unnecessary files.
-3. Add build files (BUILD.gn, proto_library.gni, protobuf.gyp,
+2. Add build files (BUILD.gn, proto_library.gni, protobuf.gyp,
    protobuf_lite.gypi, protobuf_nacl.gyp).
 
    Be sure to update the list of source files, as additional .cc files and
    headers might have been added -- you need to find the transitive closure of
    include files required by targets.
 
    Other things to care about are defines required by protobuf on various
    platforms, warnings generated by compilers, and new dependencies introduced.
-4. Get open-source library six.py from https://pypi.python.org/pypi/six/ and add
+3. Get open-source library six.py from https://pypi.python.org/pypi/six/ and add
    it to protobuf/third_party/six/six.py.
-5. Apply patches in patches/ (see the description below):
+4. Apply patches in patches/ (see the description below):
 
    $ for patch in patches/*; do patch -s -p1 < $patch; done
 
    For future releases, it will be worth looking into which patches still need
    to be applied.
 5. Generate descriptor_pb2.py using something like the following steps. Make
    sure you've regenerated your buildfiles and will build protoc from the
    newly-modified sources above.
 
    $ cd $SRC_DIR
@@ skipping 26 matching lines @@
   upstreaming the removal of static initializers is in progress:
   https://github.com/google/protobuf/issues/1404
 
 - 0004-fix-integer-types-and-shared-library-exports.patch
 
   This patch makes protobuf int64 to be int64_t (as opposed to long long in
   upstream), and similarly for other integer types. It also allows exporting
   protobuf symbols in Linux .so libraries, so that protobuf can be built as a
   component (see http://crrev.com/179806).
 
-- 0005-fix-no-threadlocal-on-mac.patch
+- 0005-fix-include-js-generator.protobuf
 
-  Apple's Clang doesn't support thread-local variables on Mac.
+  During merge with internal branch, the <> in one of the #includes were
+  accidentally replaced with "", which results in a failure in checkdeps.
 
-- 0006-fix-clang-type-errors.patch
-
-  New versions of Clang have type checking semantics that check the conformance
-  with the C++ standard more thorougly, which makes them a bit more
-  restrictive. This cherry-picks upstream commits
-  3cc35adb6dca9057a790d253b9f5e2b9b000a106 and
-  58f07644eab25f68973ecab4bdc43fc318c26131.
+  Fixed in https://github.com/google/protobuf/pull/1547.
 
 - 0007-uninline_googleonce.patch
 - 0008-uninline_get_empty_string.patch
 - 0009-uninline-arenastring.patch
 - 0010-uninline-generated-code.patch
 
   These patches uninline some functions, resulting in a significant reduction
   (somewhere between 500 KB and 1 MB) of binary size.
-- 0011-use-offsetof-for-clang.patch
 
-  This patch replaces a few invalid reinterpret_casts with __builtin_offsetof,
-  if compiled with Clang. This is a temporary patch, it should be deletd, when
-  the official github repo is updates with this changes already submitted to
-  the internal Google repo.
+- 0011-libprotobuf_export.patch
 
-  See also: https://crbug.com/607751 and
-  https://github.com/google/protobuf/issues/1450
+  During merge with internal branch, the dll export attribute was accidentally
+  removed in C++11 mode.
+
+  Fixed in https://github.com/google/protobuf/pull/1549