Revert of Dependencies are now added between the drawTargets in GrPipeline

src/gpu/GrRenderTarget.cpp

Index: src/gpu/GrRenderTarget.cpp
diff --git a/src/gpu/GrRenderTarget.cpp b/src/gpu/GrRenderTarget.cpp
index 75477021cf14330a9fc367676e7e5c609f619db3..ad56cf761fff6e62afc5380d2532d9c82af48708 100644
--- a/src/gpu/GrRenderTarget.cpp
+++ b/src/gpu/GrRenderTarget.cpp
@@ -15,13 +15,6 @@
 #include "GrGpu.h"
 #include "GrRenderTargetPriv.h"
 #include "GrStencilAttachment.h"
-
-GrRenderTarget::~GrRenderTarget() {
-    if (fLastDrawTarget) {
-        fLastDrawTarget->clearRT();
-    }
-    SkSafeUnref(fLastDrawTarget);
-}
 
 void GrRenderTarget::discard() {
     // go through context so that all necessary flushing occurs
@@ -64,26 +57,24 @@
 
 void GrRenderTarget::onRelease() {
     SkSafeSetNull(fStencilAttachment);
+    fLastDrawTarget = nullptr;
 
     INHERITED::onRelease();
 }
 
 void GrRenderTarget::onAbandon() {
     SkSafeSetNull(fStencilAttachment);
+    fLastDrawTarget = nullptr;
 
     INHERITED::onAbandon();
 }
 
 void GrRenderTarget::setLastDrawTarget(GrDrawTarget* dt) {
     if (fLastDrawTarget) {
-        // The non-MDB world never closes so we can't check this condition
-#ifdef ENABLE_MDB
         SkASSERT(fLastDrawTarget->isClosed());
-#endif
-        fLastDrawTarget->clearRT();
     }
 
-    SkRefCnt_SafeAssign(fLastDrawTarget, dt);
+    fLastDrawTarget = dt;
 }
 
 ///////////////////////////////////////////////////////////////////////////////