Isolate GrBufferAllocPools inside GrBatchTarget

src/gpu/GrPrimitiveProcessor.h

Index: src/gpu/GrPrimitiveProcessor.h
diff --git a/src/gpu/GrPrimitiveProcessor.h b/src/gpu/GrPrimitiveProcessor.h
index d66aed1ddc78fbd4bdd85b80711ff70bc1c39cd8..afdbf5c30f8021f684bfd903da72a20654fa5e35 100644
--- a/src/gpu/GrPrimitiveProcessor.h
+++ b/src/gpu/GrPrimitiveProcessor.h
@@ -66,10 +66,8 @@ private:
     SkAlignedSStorage<kMaxSize> fData;
 };
 
-class GrIndexBufferAllocPool;
 class GrGLSLCaps;
 class GrGLPrimitiveProcessor;
-class GrVertexBufferAllocPool;
 
 struct GrInitInvariantOutput;