Revert of Refactor GrBufferAllocPools to use resource cache

src/gpu/GrIndexBuffer.h

Index: src/gpu/GrIndexBuffer.h
diff --git a/src/gpu/GrIndexBuffer.h b/src/gpu/GrIndexBuffer.h
index bf64ff87d28143d18cf31810d81144ce842065fc..4dfd1c1b07713ff170fb9d18f708129d71a75c38 100644
--- a/src/gpu/GrIndexBuffer.h
+++ b/src/gpu/GrIndexBuffer.h
@@ -13,18 +13,8 @@
 
 #include "GrGeometryBuffer.h"
 
-
 class GrIndexBuffer : public GrGeometryBuffer {
 public:
-    static void ComputeScratchKey(size_t size, bool dynamic, GrScratchKey* key) {
-        static const GrScratchKey::ResourceType kType = GrScratchKey::GenerateResourceType();
-
-        GrScratchKey::Builder builder(key, kType, 2);
-
-        builder[0] = SkToUInt(size);
-        builder[1] = dynamic ? 1 : 0;
-    }
-
     /**
      * Retrieves the maximum number of quads that could be rendered
      * from the index buffer (using kTriangles_GrPrimitiveType).
@@ -35,12 +25,7 @@
     }
 protected:
     GrIndexBuffer(GrGpu* gpu, size_t gpuMemorySize, bool dynamic, bool cpuBacked)
-        : INHERITED(gpu, gpuMemorySize, dynamic, cpuBacked) {
-        GrScratchKey key;
-        ComputeScratchKey(gpuMemorySize, dynamic, &key);
-        this->setScratchKey(key);
-    }
-
+        : INHERITED(gpu, gpuMemorySize, dynamic, cpuBacked) {}
 private:
     typedef GrGeometryBuffer INHERITED;
 };