Remove WebThread

sky/engine/public/platform/WebThread.h

Index: sky/engine/public/platform/WebThread.h
diff --git a/sky/engine/public/platform/WebThread.h b/sky/engine/public/platform/WebThread.h
index 60e4731048c75607496dbb4195199fff617afe0d..2095985e23688db9a2a898f3aba16794d1eb1d2b 100644
--- a/sky/engine/public/platform/WebThread.h
+++ b/sky/engine/public/platform/WebThread.h
@@ -44,36 +44,6 @@ public:
         virtual ~Task() { }
         virtual void run() = 0;
     };
-
-    class BLINK_PLATFORM_EXPORT TaskObserver {
-    public:
-        virtual ~TaskObserver() { }
-        virtual void willProcessTask() = 0;
-        virtual void didProcessTask() = 0;
-    };
-
-    // postTask() and postDelayedTask() take ownership of the passed Task
-    // object. It is safe to invoke postTask() and postDelayedTask() from any
-    // thread.
-    virtual void postTask(Task*) = 0;
-    virtual void postDelayedTask(Task*, long long delayMs) = 0;
-
-    virtual bool isCurrentThread() const = 0;
-    virtual PlatformThreadId threadId() const { return 0; }
-
-    virtual void addTaskObserver(TaskObserver*) { }
-    virtual void removeTaskObserver(TaskObserver*) { }
-
-    // enterRunLoop() processes tasks posted to this WebThread. This call does not return until some task calls exitRunLoop().
-    // WebThread does not support nesting, meaning that once the run loop is entered for a given WebThread it is not valid to
-    // call enterRunLoop() again.
-    virtual void enterRunLoop() = 0;
-
-    // exitRunLoop() runs tasks until there are no tasks available to run, then returns control to the caller of enterRunLoop().
-    // Must be called when the WebThread is running.
-    virtual void exitRunLoop() = 0;
-
-    virtual ~WebThread() { }
 };
 
 } // namespace blink