Simplify CanvasAsyncBlobCreator by removing ContextObserver and related tests

third_party/WebKit/Source/core/html/canvas/CanvasAsyncBlobCreator.h

Index: third_party/WebKit/Source/core/html/canvas/CanvasAsyncBlobCreator.h
diff --git a/third_party/WebKit/Source/core/html/canvas/CanvasAsyncBlobCreator.h b/third_party/WebKit/Source/core/html/canvas/CanvasAsyncBlobCreator.h
index df7f1d787ee125dfa55e9135f2ee1bb74509d8fc..0a714c7002f366c818430f0f8bd78ac9cb854c6a 100644
--- a/third_party/WebKit/Source/core/html/canvas/CanvasAsyncBlobCreator.h
+++ b/third_party/WebKit/Source/core/html/canvas/CanvasAsyncBlobCreator.h
@@ -4,7 +4,6 @@
 
 #include "core/CoreExport.h"
 #include "core/dom/DOMTypedArray.h"
-#include "core/dom/ExecutionContext.h"
 #include "core/fileapi/BlobCallback.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/heap/Handle.h"
@@ -20,19 +19,15 @@ class PNGImageEncoderState;
 class CORE_EXPORT CanvasAsyncBlobCreator
     : public RefCounted<CanvasAsyncBlobCreator> {
 public:
-    static PassRefPtr<CanvasAsyncBlobCreator> create(PassRefPtr<DOMUint8ClampedArray> unpremultipliedRGBAImageData, const String& mimeType, const IntSize&, BlobCallback*, ExecutionContext*);
+    static PassRefPtr<CanvasAsyncBlobCreator> create(PassRefPtr<DOMUint8ClampedArray> unpremultipliedRGBAImageData, const String& mimeType, const IntSize&, BlobCallback*);
     void scheduleAsyncBlobCreation(bool canUseIdlePeriodScheduling, double quality = 0.0);
     virtual ~CanvasAsyncBlobCreator();
 
-protected:
-    CanvasAsyncBlobCreator(PassRefPtr<DOMUint8ClampedArray> data, const String& mimeType, const IntSize&, BlobCallback*);
-    virtual void scheduleCreateBlobAndCallOnMainThread();
-    virtual void scheduleCreateNullptrAndCallOnMainThread();
-    virtual void scheduleClearSelfRefOnMainThread();
-    std::atomic<bool> m_cancelled;
-
 private:
-    friend class CanvasAsyncBlobCreatorTest;
+    CanvasAsyncBlobCreator(PassRefPtr<DOMUint8ClampedArray> data, const String& mimeType, const IntSize&, BlobCallback*);
+    void scheduleCreateBlobAndCallOnMainThread();
+    void scheduleCreateNullptrAndCallOnMainThread();
+    void scheduleClearSelfRefOnMainThread();
 
     OwnPtr<PNGImageEncoderState> m_encoderState;
     RefPtr<DOMUint8ClampedArray> m_data;
@@ -54,13 +49,6 @@ private:
     void createBlobAndCall();
 
     void encodeImageOnEncoderThread(double quality);
-    bool initializeEncodeImageOnEncoderThread();
-    void nonprogressiveEncodeImageOnEncoderThread(double quality);
-    void progressiveEncodeImageOnEncoderThread();
-
-    class ContextObserver;
-    void createContextObserver(ExecutionContext*);
-    OwnPtrWillBePersistent<ContextObserver> m_contextObserver;
 };
 
 } // namespace blink