Remove canApplyCoverage from XP and all related functions in gpu code.

src/gpu/GrPipelineBuilder.h

Index: src/gpu/GrPipelineBuilder.h
diff --git a/src/gpu/GrPipelineBuilder.h b/src/gpu/GrPipelineBuilder.h
index ad509e14f8a57cb1e3203661daeec2b80b5024c6..904d38250c6732a5aab8d73219ac4688edfd2adb 100644
--- a/src/gpu/GrPipelineBuilder.h
+++ b/src/gpu/GrPipelineBuilder.h
@@ -49,18 +49,6 @@ public:
     /// @}
 
     /**
-     * Depending on features available in the underlying 3D API and the color blend mode requested
-     * it may or may not be possible to correctly blend with fractional pixel coverage generated by
-     * the fragment shader.
-     *
-     * This function considers the current GrPipelineBuilder and the draw target's capabilities to
-     * determine whether coverage can be handled correctly. This function assumes that the caller
-     * intends to specify fractional pixel coverage via a primitive processor but may not have
-     * specified it yet.
-     */
-    bool canUseFracCoveragePrimProc(GrColor color, const GrDrawTargetCaps& caps) const;
-
-    /**
      * This function returns true if the render target destination pixel values will be read for
      * blending during draw.
      */