Revert of add isRect() check to AAClip, to detect if a soft-clip is really just an irect (https://codereview.chromium.org/445233006/)

Reason for revert:
new code asserts on some pictures

Original issue's description:
> add isRect() check to AAClip, to detect if a soft-clip is really just an irect
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/592cb8d552556b1e922887d506d00b64bc5d0547

R=bsalomon@google.com, humper@google.com
TBR=bsalomon@google.com, humper@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: reed@google.com

Review URL: https://codereview.chromium.org/452533002

1 files changed, 0 insertions, 29 deletions

diff --git a/src/core/SkAAClip.cpp b/src/core/SkAAClip.cpp
index 54a6dcd795..14152f8317 100644
--- a/src/core/SkAAClip.cpp
+++ b/src/core/SkAAClip.cpp
@@ -684,35 +684,6 @@ bool SkAAClip::setRect(const SkIRect& bounds) {
 #endif
 }
 
-bool SkAAClip::isRect() const {
-    if (this->isEmpty()) {
-        return false;
-    }
-
-    const RunHead* head = fRunHead;
-    if (head->fRowCount != 1) {
-        return false;
-    }
-    const YOffset* yoff = head->yoffsets();
-    if (yoff->fY != fBounds.fBottom - 1) {
-        return false;
-    }
-    SkASSERT(0 == yoff->fOffset);
-
-    const uint8_t* row = head->data();
-    int width = fBounds.width();
-    do {
-        if (row[1] != 0xFF) {
-            return false;
-        }
-        int n = row[0];
-        SkASSERT(n <= width);
-        width -= n;
-        row += 2;
-    } while (width > 0);
-    return true;
-}
-
 bool SkAAClip::setRect(const SkRect& r, bool doAA) {
     if (r.isEmpty()) {
         return this->setEmpty();