Update //third_party/protobuf to version 3.

third_party/protobuf/objectivec/GPBProtocolBuffers_RuntimeSupport.h

Index: third_party/protobuf/objectivec/GPBProtocolBuffers_RuntimeSupport.h
diff --git a/third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto b/third_party/protobuf/objectivec/GPBProtocolBuffers_RuntimeSupport.h
similarity index 80%
copy from third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto
copy to third_party/protobuf/objectivec/GPBProtocolBuffers_RuntimeSupport.h
index d52cb8cc36d8924a3454f9170f6b338f14a59c5c..fea75b93bc2568353567eefaaf33d82c653f48ee 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_lite_imports_nonlite.proto
+++ b/third_party/protobuf/objectivec/GPBProtocolBuffers_RuntimeSupport.h
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// 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
@@ -28,16 +28,13 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
-//
-// Tests that a "lite" message can import a regular message.
-
-package protobuf_unittest;
-
-import "google/protobuf/unittest.proto";
+// This header is meant to only be used by the generated source, it should not
+// be included in code using protocol buffers.
 
-option optimize_for = LITE_RUNTIME;
+#import "GPBProtocolBuffers.h"
 
-message TestLiteImportsNonlite {
-  optional TestAllTypes message = 1;
-}
+#import "GPBDescriptor_PackagePrivate.h"
+#import "GPBExtensionInternals.h"
+#import "GPBMessage_PackagePrivate.h"
+#import "GPBRootObject_PackagePrivate.h"
+#import "GPBUtilities_PackagePrivate.h"