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

src/core/SkRecorder.cpp

Index: src/core/SkRecorder.cpp
diff --git a/src/core/SkRecorder.cpp b/src/core/SkRecorder.cpp
index c7869bb6a46b1a4ea07a03fe1b7e846609165ca5..19cb663eaf297c60c374ea42bcfb9b5d5bd4c7f7 100644
--- a/src/core/SkRecorder.cpp
+++ b/src/core/SkRecorder.cpp
@@ -369,10 +369,6 @@ void SkRecorder::didSetMatrix(const SkMatrix& matrix) {
     APPEND(SetMatrix, matrix);
 }
 
-void SkRecorder::didTranslateZ(SkScalar z)  {
-    APPEND(TranslateZ, z);
-}
-
 void SkRecorder::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
     INHERITED(onClipRect, rect, op, edgeStyle);
     SkRecords::RegionOpAndAA opAA(op, kSoft_ClipEdgeStyle == edgeStyle);