Remove DrawingMgr shims from GrContext

src/gpu/GrBlurUtils.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBlurUtils.h"
 #include "GrDrawContext.h"
 #include "GrCaps.h"
@@ skipping 106 matching lines @@
         desc.fConfig = kAlpha_8_GrPixelConfig;
     }
 
     GrTexture* mask = context->textureProvider()->createApproxTexture(desc);
     if (nullptr == mask) {
         return nullptr;
     }
 
     SkRect clipRect = SkRect::MakeWH(maskRect->width(), maskRect->height());
 
-    SkAutoTUnref<GrDrawContext> drawContext(context->drawContext(mask->asRenderTarget()));
+    SkAutoTUnref<GrDrawContext> drawContext(
+                                      context->drawingMgr().drawContext(mask->asRenderTarget()));
     if (!drawContext) {
         return nullptr;
     }
 
     drawContext->clear(nullptr, 0x0, true);
 
     GrPaint tempPaint;
     tempPaint.setAntiAlias(doAA);
     tempPaint.setCoverageSetOpXPFactory(SkRegion::kReplace_Op);
 
@@ skipping 149 matching lines @@
                                                               SkPaint::kFill_Style;
         draw_with_mask_filter(drawContext, context->textureProvider(),
                               clip, viewMatrix, *devPathPtr,
                               paint.getMaskFilter(), clipBounds, &grPaint, style);
         return;
     }
 
     drawContext->drawPath(clip, grPaint, viewMatrix, *pathPtr, strokeInfo);
 }