Introduce WebTaskRunner Patch 3/5

Source/platform/scheduler/CancellableTaskFactory.h

Index: Source/platform/scheduler/CancellableTaskFactory.h
diff --git a/Source/platform/scheduler/CancellableTaskFactory.h b/Source/platform/scheduler/CancellableTaskFactory.h
index a176b29a5c9e5fd9fb5aed0f5cae884ec728a1d6..2d1a642b309cc1e1a4842006e67dd875e3612195 100644
--- a/Source/platform/scheduler/CancellableTaskFactory.h
+++ b/Source/platform/scheduler/CancellableTaskFactory.h
@@ -40,7 +40,7 @@ public:
 
     // Returns a task that can be disabled by calling cancel().  The user takes
     // ownership of the task.  Creating a new task cancels any previous ones.
-    WebThread::Task* cancelAndCreate();
+    WebTaskRunner::Task* cancelAndCreate();
 
 #if defined(ADDRESS_SANITIZER)
     // The CancellableTaskFactory part object might be within a poisoned heap
@@ -52,7 +52,7 @@ public:
 #endif
 
 private:
-    class CancellableTask : public WebThread::Task {
+    class CancellableTask : public WebTaskRunner::Task {
         WTF_MAKE_NONCOPYABLE(CancellableTask);
 
     public: