Remove dangling references to deleted submodules.
am: cb4dd90cba

Change-Id: I42f0694aab1f77a1247ef00e987d6fc6860da988
diff --git a/third_party/googletest b/third_party/googletest
deleted file mode 160000
index ecd5308..0000000
--- a/third_party/googletest
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit ecd530865cefdfa7dea58e84f6aa1b548950363d
diff --git a/third_party/protobuf b/third_party/protobuf
deleted file mode 160000
index a6189ac..0000000
--- a/third_party/protobuf
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit a6189acd18b00611c1dc7042299ad75486f08a1a