Introduce WebTaskRunner Patch 3/5

Source/platform/testing/UnitTestHelpers.cpp

Index: Source/platform/testing/UnitTestHelpers.cpp
diff --git a/Source/platform/testing/UnitTestHelpers.cpp b/Source/platform/testing/UnitTestHelpers.cpp
index 371180755b025ae15f693e514dfe90510cb8e2a2..0da2683589d229d5db219c8d76c9de617e4e35f0 100644
--- a/Source/platform/testing/UnitTestHelpers.cpp
+++ b/Source/platform/testing/UnitTestHelpers.cpp
@@ -27,6 +27,7 @@
 #include "platform/testing/UnitTestHelpers.h"
 
 #include "public/platform/Platform.h"
+#include "public/platform/WebTaskRunner.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/WebTraceLocation.h"
 #include "public/platform/WebUnitTestSupport.h"
@@ -34,7 +35,7 @@
 namespace blink {
 namespace testing {
 
-class QuitTask : public WebThread::Task {
+class QuitTask : public WebTaskRunner::Task {
 public:
     virtual void run()
     {
@@ -44,7 +45,7 @@ public:
 
 void runPendingTasks()
 {
-    Platform::current()->currentThread()->postTask(FROM_HERE, new QuitTask);
+    Platform::current()->currentThread()->taskRunner()->postTask(FROM_HERE, new QuitTask);
     Platform::current()->unitTestSupport()->enterRunLoop();
 }