EDK: Make mojo::platform::TaskRunner's PostTask() take an std::function<void()>.

mojo/edk/system/channel_test_base.h

Index: mojo/edk/system/channel_test_base.h
diff --git a/mojo/edk/system/channel_test_base.h b/mojo/edk/system/channel_test_base.h
index 4ca931cd267485cbb167734a2dc968daf23a3fc9..92b236c27ba1a79530767d29c2ef1e8dee1f4fba 100644
--- a/mojo/edk/system/channel_test_base.h
+++ b/mojo/edk/system/channel_test_base.h
@@ -7,7 +7,6 @@
 
 #include <memory>
 
-#include "base/bind.h"
 #include "mojo/edk/embedder/simple_platform_support.h"
 #include "mojo/edk/system/channel.h"
 #include "mojo/edk/system/test/test_io_thread.h"
@@ -30,12 +29,6 @@ class ChannelTestBase : public testing::Test {
 
   void SetUp() override;
 
-  template <typename Functor, typename... Args>
-  void PostMethodToIOThreadAndWait(Functor functor, const Args&... args) {
-    io_thread_.PostTaskAndWait(
-        base::Bind(functor, base::Unretained(this), args...));
-  }
-
   // These should only be called from |io_thread()|:
   void CreateChannelOnIOThread(unsigned i);
   void InitChannelOnIOThread(unsigned i);