Revert "forward concat44 in nway canvas"

This reverts commit 8964bc13dafc7aa82d8179a450726de9f0f46f25.

Reason for revert: break flutter unittest?

Original change's description:
> forward concat44 in nway canvas
> 
> Change-Id: If4eb791c0701fb7055283e721308bd3c633576d7
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263572
> Reviewed-by: Mike Reed <reed@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=reed@google.com

Change-Id: I0c8e3b3d0df05948f935ffa6d72ea84ef420b7cc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263714
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/samplecode/SampleClip.cpp b/samplecode/SampleClip.cpp
index a25bd54..b5d6a78 100644
--- a/samplecode/SampleClip.cpp
+++ b/samplecode/SampleClip.cpp
@@ -547,7 +547,7 @@
     }
 
     void onDrawContent(SkCanvas* canvas) override {
-        SkMatrix44 mx = this->get44({0, 0, 400, 400});
+        SkMatrix mx = this->get44({0, 0, 400, 400});
 
         SkPaint paint;
         paint.setColor({0.75, 0.75, 0.75, 1});
@@ -612,10 +612,12 @@
     }
 
     void onDrawContent(SkCanvas* canvas) override {
+        SkMatrix mx = this->get44({0, 0, 300, 300});
+
         SkPaint paint;
 
         canvas->save();
-        canvas->concat(this->get44({0, 0, 300, 300}));
+        canvas->concat(mx);
 
         const SkPoint* tex = nullptr;
         const SkColor* col = nullptr;