third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/map_field.h

Index: third_party/protobuf/src/google/protobuf/map_field.h
diff --git a/third_party/protobuf/src/google/protobuf/map_field.h b/third_party/protobuf/src/google/protobuf/map_field.h
index 4b46f3aa027f3489e063066c9023d0ecce51e8fd..d6af8532d28cf64f7289fae6ed02abba5308bc9b 100644
--- a/third_party/protobuf/src/google/protobuf/map_field.h
+++ b/third_party/protobuf/src/google/protobuf/map_field.h
@@ -54,7 +54,7 @@ class ContendedMapCleanTest;
 class GeneratedMessageReflection;
 class MapFieldAccessor;
 
-// This class provides accesss to map field using reflection, which is the same
+// This class provides access to map field using reflection, which is the same
 // as those provided for RepeatedPtrField<Message>. It is used for internal
 // reflection implentation only. Users should never use this directly.
 class LIBPROTOBUF_EXPORT MapFieldBase {
@@ -208,7 +208,7 @@ class TypeDefinedMapFieldBase : public MapFieldBase {
   virtual void SetMapIteratorValue(MapIterator* map_iter) const = 0;
 };
 
-// This class provides accesss to map field using generated api. It is used for
+// This class provides access to map field using generated api. It is used for
 // internal generated message implentation only. Users should never use this
 // directly.
 template <typename Key, typename T,