Update //third_party/protobuf to version 3.

third_party/protobuf/patches/0010-uninline-generated-code.patch

Index: third_party/protobuf/patches/0010-uninline-generated-code.patch
diff --git a/third_party/protobuf/patches/0010-uninline-generated-code.patch b/third_party/protobuf/patches/0010-uninline-generated-code.patch
new file mode 100644
index 0000000000000000000000000000000000000000..85274dee8dcceb279f5b9164664b43ebeafad7a0
--- /dev/null
+++ b/third_party/protobuf/patches/0010-uninline-generated-code.patch
@@ -0,0 +1,34 @@
+unchanged:
+--- protobuf-cleaned/src/google/protobuf/compiler/cpp/cpp_file.cc	2015-12-30 13:21:46.000000000 -0800
++++ protobuf-patched/src/google/protobuf/compiler/cpp/cpp_file.cc	2016-03-31 13:25:40.252007316 -0700
+@@ -337,7 +337,7 @@
+           "namespace {\n"
+           "\n"
+           "static void MergeFromFail(int line) GOOGLE_ATTRIBUTE_COLD;\n"
+-          "static void MergeFromFail(int line) {\n"
++          "GOOGLE_ATTRIBUTE_NOINLINE static void MergeFromFail(int line) {\n"
+           "  GOOGLE_CHECK(false) << __FILE__ << \":\" << line;\n"
+           "}\n"
+           "\n"
+only in patch2:
+unchanged:
+--- protobuf-cleaned/src/google/protobuf/compiler/cpp/cpp_message.cc	2015-12-30 13:21:46.000000000 -0800
++++ protobuf-patched/src/google/protobuf/compiler/cpp/cpp_message.cc	2016-03-31 13:25:40.888006485 -0700
+@@ -1035,7 +1035,7 @@
+   }
+ 
+   printer->Print(vars,
+-    "void Swap($classname$* other);\n"
++    "GOOGLE_ATTRIBUTE_NOINLINE void Swap($classname$* other);\n"
+     "\n"
+     "// implements Message ----------------------------------------------\n"
+     "\n"
+@@ -2586,7 +2586,7 @@
+     // ownership situation: swapping across arenas or between an arena and a
+     // heap requires copying.
+     printer->Print(
+-        "void $classname$::Swap($classname$* other) {\n"
++        "GOOGLE_ATTRIBUTE_NOINLINE void $classname$::Swap($classname$* other) {\n"
+         "  if (other == this) return;\n"
+         "  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {\n"
+         "    InternalSwap(other);\n"