Revert of Added the framework for having canvas/recorder/picture record depth_set's.

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 6816d4ea9bb52a8856c9b9518cfc982787357ee3..ce90275047a6466cf9217e32bc0e9505ed8eff36 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -294,22 +294,17 @@
     SkMatrix        fMatrix;
     int             fDeferredSaveCount;
 
-    // This is the current cumulative depth (aggregate of all done translateZ calls)
-    SkScalar        fCurDrawDepth;
-
     MCRec(bool conservativeRasterClip) : fRasterClip(conservativeRasterClip) {
         fFilter     = nullptr;
         fLayer      = nullptr;
         fTopLayer   = nullptr;
         fMatrix.reset();
         fDeferredSaveCount = 0;
-        fCurDrawDepth      = 0;
 
         // don't bother initializing fNext
         inc_rec();
     }
-    MCRec(const MCRec& prev) : fRasterClip(prev.fRasterClip), fMatrix(prev.fMatrix),
-                               fCurDrawDepth(prev.fCurDrawDepth) {
+    MCRec(const MCRec& prev) : fRasterClip(prev.fRasterClip), fMatrix(prev.fMatrix) {
         fFilter = SkSafeRef(prev.fFilter);
         fLayer = nullptr;
         fTopLayer = prev.fTopLayer;
@@ -1526,16 +1521,6 @@
     this->setMatrix(SkMatrix::I());
 }
 
-void SkCanvas::translateZ(SkScalar z) {
-    this->checkForDeferredSave();
-    this->fMCRec->fCurDrawDepth += z;
-    this->didTranslateZ(z);
-}
-
-SkScalar SkCanvas::getZ() const {
-    return this->fMCRec->fCurDrawDepth;
-}
-
 //////////////////////////////////////////////////////////////////////////////
 
 void SkCanvas::clipRect(const SkRect& rect, SkRegion::Op op, bool doAA) {