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

src/core/SkPictureRecord.cpp

Index: src/core/SkPictureRecord.cpp
diff --git a/src/core/SkPictureRecord.cpp b/src/core/SkPictureRecord.cpp
index 3b70b56774d62b0f26dae2e5f5528f7973e1574c..17ed1aa20b69ea5c1470e82c06280d935bde01a7 100644
--- a/src/core/SkPictureRecord.cpp
+++ b/src/core/SkPictureRecord.cpp
@@ -218,15 +218,6 @@ void SkPictureRecord::didSetMatrix(const SkMatrix& matrix) {
     this->INHERITED::didSetMatrix(matrix);
 }
 
-void SkPictureRecord::didTranslateZ(SkScalar z) {
-    this->validate(fWriter.bytesWritten(), 0);
-    // set Z
-    size_t size = sizeof(SkScalar);
-    size_t initialOffset = this->addDraw(TRANSLATE_Z, &size);
-
-    this->validate(initialOffset, size);
-}
-
 static bool regionOpExpands(SkRegion::Op op) {
     switch (op) {
         case SkRegion::kUnion_Op: