Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/objectivec/Tests/GPBUnittestProtos.m

Index: third_party/protobuf/objectivec/Tests/GPBUnittestProtos.m
diff --git a/third_party/protobuf/objectivec/Tests/GPBUnittestProtos.m b/third_party/protobuf/objectivec/Tests/GPBUnittestProtos.m
index 756bd99ef77d277b07f29cc87c98763634ee4453..d19beee9247af83014832c1814cb60be80b27397 100644
--- a/third_party/protobuf/objectivec/Tests/GPBUnittestProtos.m
+++ b/third_party/protobuf/objectivec/Tests/GPBUnittestProtos.m
@@ -36,15 +36,12 @@
 // a descriptor as it doesn't use the classes/enums.
 #import "google/protobuf/Descriptor.pbobjc.m"
 
-#import "google/protobuf/AnyTest.pbobjc.m"
 #import "google/protobuf/MapProto2Unittest.pbobjc.m"
 #import "google/protobuf/MapUnittest.pbobjc.m"
 #import "google/protobuf/Unittest.pbobjc.m"
 #import "google/protobuf/UnittestArena.pbobjc.m"
 #import "google/protobuf/UnittestCustomOptions.pbobjc.m"
 #import "google/protobuf/UnittestCycle.pbobjc.m"
-#import "google/protobuf/UnittestDeprecated.pbobjc.m"
-#import "google/protobuf/UnittestDeprecatedFile.pbobjc.m"
 #import "google/protobuf/UnittestDropUnknownFields.pbobjc.m"
 #import "google/protobuf/UnittestEmbedOptimizeFor.pbobjc.m"
 #import "google/protobuf/UnittestEmpty.pbobjc.m"
@@ -65,11 +62,3 @@
 #import "google/protobuf/UnittestPreserveUnknownEnum.pbobjc.m"
 #import "google/protobuf/UnittestRuntimeProto2.pbobjc.m"
 #import "google/protobuf/UnittestRuntimeProto3.pbobjc.m"
-
-#import "google/protobuf/UnittestExtensionChainA.pbobjc.m"
-#import "google/protobuf/UnittestExtensionChainB.pbobjc.m"
-#import "google/protobuf/UnittestExtensionChainC.pbobjc.m"
-#import "google/protobuf/UnittestExtensionChainD.pbobjc.m"
-#import "google/protobuf/UnittestExtensionChainE.pbobjc.m"
-// See GPBUnittestProtos2.m for for "UnittestExtensionChainF.pbobjc.m"
-#import "google/protobuf/UnittestExtensionChainG.pbobjc.m"