Revert of allow canvas to force conservative clips (for speed)

src/core/SkDeviceLooper.cpp

Index: src/core/SkDeviceLooper.cpp
diff --git a/src/core/SkDeviceLooper.cpp b/src/core/SkDeviceLooper.cpp
index a8350cc0272c9f2a278ab3ff50fea96ebeca2f50..9346465dfc9f28f102bcdb1903819f8bf25b4578 100644
--- a/src/core/SkDeviceLooper.cpp
+++ b/src/core/SkDeviceLooper.cpp
@@ -10,10 +10,9 @@
 SkDeviceLooper::SkDeviceLooper(const SkBitmap& base,
                                const SkRasterClip& rc,
                                const SkIRect& bounds, bool aa)
-    : fBaseBitmap(base)
-    , fBaseRC(rc)
-    , fSubsetRC(rc.isForceConservativeRects())
-    , fDelta(aa ? kAA_Delta : kBW_Delta)
+: fBaseBitmap(base)
+, fBaseRC(rc)
+, fDelta(aa ? kAA_Delta : kBW_Delta)
 {
     // sentinels that next() has not yet been called, and so our mapper functions
     // should not be called either.