Revert of 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 ab7c7cd3367434abdb4b4b2c7c1234ff2f27069e..4a6ece17f25a8ce864601ffd706cdf2ebb4aa42a 100644
--- a/src/core/SkPictureRecord.cpp
+++ b/src/core/SkPictureRecord.cpp
@@ -216,15 +216,6 @@
     this->addMatrix(matrix);
     this->validate(initialOffset, size);
     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) {