Re-land: cc: Remove WorkerPool class and instead use TaskGraphRunner directly.

cc/resources/raster_worker_pool_unittest.cc

Index: cc/resources/raster_worker_pool_unittest.cc
diff --git a/cc/resources/raster_worker_pool_unittest.cc b/cc/resources/raster_worker_pool_unittest.cc
index aae742520a30c2104635d193b0ea61e20ac9699a..1b55475dbfc2ae1f85686f765d8a56420d03ee1d 100644
--- a/cc/resources/raster_worker_pool_unittest.cc
+++ b/cc/resources/raster_worker_pool_unittest.cc
@@ -34,15 +34,16 @@ class TestRasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
   TestRasterWorkerPoolTaskImpl(
       const Resource* resource,
       const Reply& reply,
-      TaskVector* dependencies,
+      internal::Task::Vector* dependencies,
       bool use_gpu_rasterization)
       : internal::RasterWorkerPoolTask(resource,
                                        dependencies,
                                        use_gpu_rasterization),
         reply_(reply),
-        raster_thread_(RASTER_THREAD_NONE) {}
+        raster_thread_(RASTER_THREAD_NONE) {
+  }
 
-  // Overridden from internal::WorkerPoolTask:
+  // Overridden from internal::RasterWorkerPoolTask:
   virtual bool RunOnWorkerThread(unsigned thread_index,
                                  void* buffer,
                                  gfx::Size size,
@@ -75,15 +76,16 @@ class BlockingRasterWorkerPoolTaskImpl : public TestRasterWorkerPoolTaskImpl {
   BlockingRasterWorkerPoolTaskImpl(const Resource* resource,
                                    const Reply& reply,
                                    base::Lock* lock,
-                                   TaskVector* dependencies,
+                                   internal::Task::Vector* dependencies,
                                    bool use_gpu_rasterization)
       : TestRasterWorkerPoolTaskImpl(resource,
                                      reply,
                                      dependencies,
                                      use_gpu_rasterization),
-        lock_(lock) {}
+        lock_(lock) {
+  }
 
-  // Overridden from TestRasterWorkerPoolTaskImpl:
+  // Overridden from internal::RasterWorkerPoolTask:
   virtual bool RunOnWorkerThread(unsigned thread_index,
                                  void* buffer,
                                  gfx::Size size,