Disable DrainPeriodRespected test that is broken.

Change-Id: I119fc5f31d044e75a73ede9b3b21cccca84acdd2
diff --git a/src/ftrace_reader/ftrace_controller_unittest.cc b/src/ftrace_reader/ftrace_controller_unittest.cc
index 1d30d06..3555695 100644
--- a/src/ftrace_reader/ftrace_controller_unittest.cc
+++ b/src/ftrace_reader/ftrace_controller_unittest.cc
@@ -327,7 +327,8 @@
   sink.reset();
 }
 
-TEST(FtraceControllerTest, DrainPeriodRespected) {
+// TODO(b/73452932): Fix and reenable this test.
+TEST(FtraceControllerTest, DISABLED_DrainPeriodRespected) {
   MockTaskRunner task_runner;
   auto ftrace_procfs =
       std::unique_ptr<MockFtraceProcfs>(new MockFtraceProcfs());