Remove forceRenderTargetFlush (unused)

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index e8ccc26b1d8c9a0e1668f6e8323a3341b65ba9ce..d73fa59ace27cf2aca6816f8d5704457200eadbb 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -141,13 +141,6 @@ public:
     void resolveRenderTarget(GrRenderTarget* target);
 
     /**
-     * Ensures that the current render target is actually set in the
-     * underlying 3D API. Used when client wants to use 3D API to directly
-     * render to the RT.
-     */
-    void forceRenderTargetFlush();
-
-    /**
      * Gets a preferred 8888 config to use for writing/reading pixel data to/from a surface with
      * config surfaceConfig. The returned config must have at least as many bits per channel as the
      * readConfig or writeConfig param.
@@ -442,9 +435,6 @@ private:
     virtual void onGpuDrawPaths(size_t, const GrPath**, const SkMatrix*,
                                 SkPath::FillType, SkStrokeRec::Style) = 0;
 
-    // overridden by backend-specific derived class to perform flush
-    virtual void onForceRenderTargetFlush() = 0;
-
     // overridden by backend-specific derived class to perform the read pixels.
     virtual bool onReadPixels(GrRenderTarget* target,
                               int left, int top, int width, int height,