Merge pull request #3085 from crast/fix-googletest-submodule

googletest uses https like all the other submodules

.gitmodules

@@ -14,4 +14,4 @@
 	url = https://github.com/gflags/gflags.git
 [submodule "third_party/googletest"]
 	path = third_party/googletest
-	url = git://github.com/google/googletest
+	url = https://github.com/google/googletest.git