Revert of Consolidate GPU buffer implementations

src/gpu/batches/GrDefaultPathRenderer.cpp

Index: src/gpu/batches/GrDefaultPathRenderer.cpp
diff --git a/src/gpu/batches/GrDefaultPathRenderer.cpp b/src/gpu/batches/GrDefaultPathRenderer.cpp
index 0a3dcd6a1444f5864e3bdc7536c5df1031f8d7b7..acaff173c6a37f5ada5cd03a5c6d3bf7146927a9 100644
--- a/src/gpu/batches/GrDefaultPathRenderer.cpp
+++ b/src/gpu/batches/GrDefaultPathRenderer.cpp
@@ -313,7 +313,7 @@
         }
 
         // allocate vertex / index buffers
-        const GrBuffer* vertexBuffer;
+        const GrVertexBuffer* vertexBuffer;
         int firstVertex;
 
         void* verts = target->makeVertexSpace(vertexStride, maxVertices,
@@ -324,7 +324,7 @@
             return;
         }
 
-        const GrBuffer* indexBuffer = nullptr;
+        const GrIndexBuffer* indexBuffer = nullptr;
         int firstIndex = 0;
 
         void* indices = nullptr;