SaveFlags be-gone

Remove the deprecated save(SaveFlags), willSave(SaveFlags) and all
traces of kMatrix_SaveFlags/kClip_SaveFlag.

BUG=skia:2297
R=mtklein@google.com, reed@google.com, robertphillips@google.com

Review URL: https://codereview.chromium.org/340403003
diff --git a/src/utils/SkProxyCanvas.cpp b/src/utils/SkProxyCanvas.cpp
index 5cb5469..3aa459c 100644
--- a/src/utils/SkProxyCanvas.cpp
+++ b/src/utils/SkProxyCanvas.cpp
@@ -21,9 +21,9 @@
 
 ///////////////////////////////// Overrides ///////////
 
-void SkProxyCanvas::willSave(SaveFlags flags) {
-    fProxy->save(flags);
-    this->INHERITED::willSave(flags);
+void SkProxyCanvas::willSave() {
+    fProxy->save();
+    this->INHERITED::willSave();
 }
 
 SkCanvas::SaveLayerStrategy SkProxyCanvas::willSaveLayer(const SkRect* bounds, const SkPaint* paint,