Revert of Mojo EDK: Introduce MojoQueryHandleSignalsState API

mojo/edk/test/mojo_test_base.h

Index: mojo/edk/test/mojo_test_base.h
diff --git a/mojo/edk/test/mojo_test_base.h b/mojo/edk/test/mojo_test_base.h
index 35e2c2b12f9986b85a99daade269382eb713789c..fa5b64ced93a1d497017a8fa6d551ffe1de4eac0 100644
--- a/mojo/edk/test/mojo_test_base.h
+++ b/mojo/edk/test/mojo_test_base.h
@@ -30,6 +30,8 @@
   ~MojoTestBase() override;
 
   using LaunchType = MultiprocessTestHelper::LaunchType;
+
+ protected:
   using HandlerCallback = base::Callback<void(ScopedMessagePipeHandle)>;
 
   class ClientController {
@@ -149,14 +151,6 @@
 
   // Reads data from a data pipe.
   static std::string ReadData(MojoHandle consumer, size_t size);
-
-  // Queries the signals state of |handle|.
-  static MojoHandleSignalsState GetSignalsState(MojoHandle handle);
-
-  // Helper to block the calling thread waiting for signals to be raised.
-  static MojoResult WaitForSignals(MojoHandle handle,
-                                   MojoHandleSignals signals,
-                                   MojoHandleSignalsState* state = nullptr);
 
   void set_launch_type(LaunchType launch_type) { launch_type_ = launch_type; }