Revert of GrBatchPrototype (patchset #30 id:570001 of https://codereview.chromium.org/845103005/)

Reason for revert:
creates large performance regression

Original issue's description:
> GrBatchPrototype
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/d15e4e45374275c045572b304c229237c4a82be4

TBR=bsalomon@google.com,joshualitt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/862823004
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index b89d70e..e8a758d 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -6,9 +6,9 @@
  * found in the LICENSE file.
  */
 
-#include "GrDrawTarget.h"
 
-#include "GrBatch.h"
+
+#include "GrDrawTarget.h"
 #include "GrContext.h"
 #include "GrDrawTargetCaps.h"
 #include "GrPath.h"
@@ -526,29 +526,6 @@
     }
 }
 
-
-void GrDrawTarget::drawBatch(GrPipelineBuilder* pipelineBuilder,
-                             GrBatch* batch,
-                             const SkRect* devBounds) {
-    SkASSERT(pipelineBuilder);
-    // TODO some kind of checkdraw, but not at this level
-
-    // Setup clip
-    GrScissorState scissorState;
-    GrPipelineBuilder::AutoRestoreEffects are;
-    GrPipelineBuilder::AutoRestoreStencil ars;
-    if (!this->setupClip(pipelineBuilder, &are, &ars, &scissorState, devBounds)) {
-        return;
-    }
-
-    GrDeviceCoordTexture dstCopy;
-    if (!this->setupDstReadIfNecessary(pipelineBuilder, &dstCopy, devBounds)) {
-        return;
-    }
-
-    this->onDrawBatch(batch, *pipelineBuilder, scissorState, dstCopy.texture() ? &dstCopy : NULL);
-}
-
 static const GrStencilSettings& winding_path_stencil_settings() {
     GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
         kIncClamp_StencilOp,