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

mojo/edk/system/endpoint_relayer_unittest.cc

Index: mojo/edk/system/endpoint_relayer_unittest.cc
diff --git a/mojo/edk/system/endpoint_relayer_unittest.cc b/mojo/edk/system/endpoint_relayer_unittest.cc
index 5a4f813ec9fe0f089fca07dbb25852aee2c35ca0..57c3d9a7016943c9f9373b7b3cc701f5f38938f4 100644
--- a/mojo/edk/system/endpoint_relayer_unittest.cc
+++ b/mojo/edk/system/endpoint_relayer_unittest.cc
@@ -33,10 +33,10 @@ class EndpointRelayerTest : public test::ChannelTestBase {
   void SetUp() override {
     test::ChannelTestBase::SetUp();
 
-    PostMethodToIOThreadAndWait(
-        &EndpointRelayerTest::CreateAndInitChannelOnIOThread, 0);
-    PostMethodToIOThreadAndWait(
-        &EndpointRelayerTest::CreateAndInitChannelOnIOThread, 1);
+    io_thread()->PostTaskAndWait([this]() {
+      CreateAndInitChannelOnIOThread(0);
+      CreateAndInitChannelOnIOThread(1);
+    });
 
     // The set up:
     // * Across the pair of channels, we'll have a pair of connections (call
@@ -67,10 +67,10 @@ class EndpointRelayerTest : public test::ChannelTestBase {
   }
 
   void TearDown() override {
-    PostMethodToIOThreadAndWait(&EndpointRelayerTest::ShutdownChannelOnIOThread,
-                                0);
-    PostMethodToIOThreadAndWait(&EndpointRelayerTest::ShutdownChannelOnIOThread,
-                                1);
+    io_thread()->PostTaskAndWait([this]() {
+      ShutdownChannelOnIOThread(0);
+      ShutdownChannelOnIOThread(1);
+    });
 
     test::ChannelTestBase::TearDown();
   }