Revert of Make GrResourceCache dynamically change between LRU and random replacement strategies.

include/gpu/GrGpuResource.h

Index: include/gpu/GrGpuResource.h
diff --git a/include/gpu/GrGpuResource.h b/include/gpu/GrGpuResource.h
index 6f8280acb2173b304305f0a06ae8cca8ca69a980..364a886408cf841dded13491d811cac14fe3cde1 100644
--- a/include/gpu/GrGpuResource.h
+++ b/include/gpu/GrGpuResource.h
@@ -58,7 +58,6 @@
         this->validate();
 
         if (!(--fRefCnt)) {
-            SkASSERT(fRefCnt >= 0);
             if (!static_cast<const DERIVED*>(this)->notifyRefCountIsZero()) {
                 return;
             }
@@ -118,7 +117,6 @@
 
 private:
     void didRemoveRefOrPendingIO(CntType cntTypeRemoved) const {
-        this->validate();
         if (0 == fPendingReads && 0 == fPendingWrites && 0 == fRefCnt) {
             static_cast<const DERIVED*>(this)->notifyAllCntsAreZero(cntTypeRemoved);
         }