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

third_party/protobuf/BUILD.gn

Index: third_party/protobuf/BUILD.gn
diff --git a/third_party/protobuf/BUILD.gn b/third_party/protobuf/BUILD.gn
index 8211662957579b073146ca338822f42b2946dc75..8709b402e0ac1f7f0d3e0e8f17aa75ea40f5dbd8 100644
--- a/third_party/protobuf/BUILD.gn
+++ b/third_party/protobuf/BUILD.gn
@@ -70,6 +70,7 @@ protobuf_lite_sources = [
   "src/google/protobuf/stubs/atomicops_internals_mips_gcc.h",
   "src/google/protobuf/stubs/atomicops_internals_pnacl.h",
   "src/google/protobuf/stubs/atomicops_internals_power.h",
+  "src/google/protobuf/stubs/atomicops_internals_ppc_gcc.h",
   "src/google/protobuf/stubs/atomicops_internals_solaris.h",
   "src/google/protobuf/stubs/atomicops_internals_tsan.h",
   "src/google/protobuf/stubs/atomicops_internals_x86_gcc.cc",
@@ -131,6 +132,7 @@ if (is_win) {
     "/wd4305",  # double to float truncation
     "/wd4355",  # 'this' used in base member initializer list
     "/wd4506",  # no definition for inline function (protobuf issue #240)
+    "/wd4715",  # not all control paths return a value (fixed in trunk)
   ]
 }
 
@@ -387,6 +389,7 @@ if (current_toolchain == host_toolchain) {
       "src/google/protobuf/compiler/csharp/csharp_message.h",
       "src/google/protobuf/compiler/csharp/csharp_message_field.cc",
       "src/google/protobuf/compiler/csharp/csharp_message_field.h",
+      "src/google/protobuf/compiler/csharp/csharp_options.h",
       "src/google/protobuf/compiler/csharp/csharp_primitive_field.cc",
       "src/google/protobuf/compiler/csharp/csharp_primitive_field.h",
       "src/google/protobuf/compiler/csharp/csharp_reflection_class.cc",
@@ -415,6 +418,8 @@ if (current_toolchain == host_toolchain) {
       "src/google/protobuf/compiler/java/java_enum_lite.h",
       "src/google/protobuf/compiler/java/java_extension.cc",
       "src/google/protobuf/compiler/java/java_extension.h",
+      "src/google/protobuf/compiler/java/java_extension_lite.cc",
+      "src/google/protobuf/compiler/java/java_extension_lite.h",
       "src/google/protobuf/compiler/java/java_field.cc",
       "src/google/protobuf/compiler/java/java_field.h",
       "src/google/protobuf/compiler/java/java_file.cc",