Remove deferred clear from SkGpuDevice

src/gpu/gl/GrGLGpu.h

Index: src/gpu/gl/GrGLGpu.h
diff --git a/src/gpu/gl/GrGLGpu.h b/src/gpu/gl/GrGLGpu.h
index 6f194dcd6c4296ebaebb0b1ec5ba86f6329e6d43..62330480e6ee1ba1c81646cb1dd7edec8b49c6e0 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -126,9 +126,9 @@ public:
                                                                 int height) override;
 
     GrBackendObject createTestingOnlyBackendTexture(void* pixels, int w, int h,
-                                                    GrPixelConfig config) const override;
+                                                    GrPixelConfig config) override;
     bool isTestingOnlyBackendTexture(GrBackendObject) const override;
-    void deleteTestingOnlyBackendTexture(GrBackendObject, bool abandonTexture) const override;
+    void deleteTestingOnlyBackendTexture(GrBackendObject, bool abandonTexture) override;
 
     void resetShaderCacheForTesting() const override;