Pull new version of protobuf sources.

third_party/protobuf/patches/01_build_fixes.patch

Index: third_party/protobuf/patches/01_build_fixes.patch
diff --git a/third_party/protobuf/patches/01_build_fixes.patch b/third_party/protobuf/patches/01_build_fixes.patch
new file mode 100644
index 0000000000000000000000000000000000000000..35d6ecd6bbb2d52507a5b6e173e5ca7fa33c714c
--- /dev/null
+++ b/third_party/protobuf/patches/01_build_fixes.patch
@@ -0,0 +1,47 @@
+diff --git a/third_party/protobuf/README.chromium b/third_party/protobuf/README.chromium
+index d845dfa..a3fb161 100644
+--- a/third_party/protobuf/README.chromium
++++ b/third_party/protobuf/README.chromium
+@@ -19,6 +19,9 @@ Steps used to create the current version:
+       will need to modify the README to include the correct revision, and modify
+       the buildfiles to reflect the actual files in the source tree, what they
+       #include, what warnings they trigger, etc.
++  01: Miscellaneous build fixes to make the upstream sources compile.  At this
++      point you should be able to build the protobuf_* and protoc targets (but
++      not necessarily anything depending on them).
+ (3) 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.
+diff --git a/third_party/protobuf/src/google/protobuf/arena.h b/third_party/protobuf/src/google/protobuf/arena.h
+index 51149ba..ed9afc9 100644
+--- a/third_party/protobuf/src/google/protobuf/arena.h
++++ b/third_party/protobuf/src/google/protobuf/arena.h
+@@ -34,7 +34,16 @@
+ #if __cplusplus >= 201103L
+ #include <google/protobuf/stubs/type_traits.h>
+ #endif
++#if defined(_MSC_VER) && !_HAS_EXCEPTIONS
++// Work around bugs in MSVC <typeinfo> header when _HAS_EXCEPTIONS=0.
++#include <exception>
+ #include <typeinfo>
++namespace std {
++using type_info = ::type_info;
++}
++#else
++#include <typeinfo>
++#endif
+ 
+ #include <google/protobuf/stubs/atomic_sequence_num.h>
+ #include <google/protobuf/stubs/atomicops.h>
+diff --git a/third_party/protobuf/src/google/protobuf/stubs/time.cc b/third_party/protobuf/src/google/protobuf/stubs/time.cc
+index 3319a24..49c0412 100644
+--- a/third_party/protobuf/src/google/protobuf/stubs/time.cc
++++ b/third_party/protobuf/src/google/protobuf/stubs/time.cc
+@@ -21,7 +21,6 @@ static const int64 kSecondsFromEraToEpoch = 62135596800LL;
+ static const int64 kMinTime = -62135596800LL;  // 0001-01-01T00:00:00
+ static const int64 kMaxTime = 253402300799LL;  // 9999-12-31T23:59:59
+ 
+-static const int kNanosPerSecond = 1000000000;
+ static const int kNanosPerMillisecond = 1000000;
+ static const int kNanosPerMicrosecond = 1000;
+