DM: some refactoring

dm/DMComparisonTask.h

Index: dm/DMComparisonTask.h
diff --git a/dm/DMComparisonTask.h b/dm/DMComparisonTask.h
deleted file mode 100644
index 265a58ce325c4256878c89427fc30eb3e5424369..0000000000000000000000000000000000000000
--- a/dm/DMComparisonTask.h
+++ /dev/null
@@ -1,31 +0,0 @@
-#ifndef DMComparisonTask_DEFINED
-#define DMComparisonTask_DEFINED
-
-#include "DMTask.h"
-#include "SkBitmap.h"
-#include "SkString.h"
-#include "gm_expectations.h"
-
-namespace DM {
-
-// We use ComparisonTask to move CPU-bound comparison work of GpuTasks back to
-// the main thread pool, where we probably have more threads available.
-
-class ComparisonTask : public Task {
-public:
-    ComparisonTask(const Task& parent, skiagm::Expectations, SkBitmap);
-
-    virtual void draw() SK_OVERRIDE;
-    virtual bool usesGpu() const SK_OVERRIDE { return false; }
-    virtual bool shouldSkip() const SK_OVERRIDE { return false; }
-    virtual SkString name() const SK_OVERRIDE { return fName; }
-
-private:
-    const SkString fName;
-    const skiagm::Expectations fExpectations;
-    const SkBitmap fBitmap;
-};
-
-}  // namespace DM
-
-#endif  // DMComparisonTask_DEFINED