Revert of Replace GrResourceCache with GrResourceCache2. (patchset #7 id:120001 of https://codereview.chromium.org/716143004/)

Reason for revert:
broken again

Original issue's description:
> Replace GrResourceCache with GrResourceCache2.
>
> BUG=skia:2889
>
> Committed: https://skia.googlesource.com/skia/+/66a450f21a3da174b7eed89a1d5fc8591e8b6ee6
>
> Committed: https://skia.googlesource.com/skia/+/407aa584d183c1bf314f5defd1cf0202e8a96c89

TBR=robertphillips@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2889

Review URL: https://codereview.chromium.org/726913002
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index 5286984..611059a 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -9,7 +9,7 @@
 #include "GrTest.h"
 
 #include "GrInOrderDrawBuffer.h"
-#include "GrResourceCache2.h"
+#include "GrResourceCache.h"
 
 void GrTestTarget::init(GrContext* ctx, GrDrawTarget* target) {
     SkASSERT(!fContext);
@@ -38,7 +38,7 @@
 }
 
 void GrContext::purgeAllUnlockedResources() {
-    fResourceCache2->purgeAllUnlocked();
+    fResourceCache->purgeAllUnlocked();
 }
 
 ///////////////////////////////////////////////////////////////////////////////