Revert "Merge GrOpList and GrRTOpList and rename to GrOpsTask."

This reverts commit 2a5954140b49d18e5161a30a4ae2c7ac28bc1993.

Reason for revert: breaking everything

Original change's description:
> Merge GrOpList and GrRTOpList and rename to GrOpsTask.
> 
> Change-Id: I8f4f2218a30fd0541a8f79f7bb9850f9500cd243
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/236343
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com

Change-Id: I27840ea0343e8e6b388556afb7bd2e76386d611d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/236349
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/tools/mdbviz/Model.cpp b/tools/mdbviz/Model.cpp
index 0243d00..3cb01f0 100644
--- a/tools/mdbviz/Model.cpp
+++ b/tools/mdbviz/Model.cpp
@@ -21,7 +21,7 @@
 }
 
 Model::~Model() {
-    this->resetOpsTask();
+    this->resetOpList();
 }
 
 Model::ErrorCode Model::load(const char* filename) {
@@ -42,7 +42,7 @@
         temp->setPicture(pic.get());
         pic->playback(temp.get());
         temp->setPicture(nullptr);
-        this->resetOpsTask();
+        this->resetOpList();
         temp->detachCommands(&fOps);
     }
 
@@ -105,7 +105,7 @@
     canvas.restoreToCount(saveCount);
 }
 
-void Model::resetOpsTask() {
+void Model::resetOpList() {
     for (int i = 0; i < fOps.count(); ++i) {
         delete fOps[i];
     }