Reland "Remove devKerning"

This is a reland of c86c5c0144b85d0bc8ec791f9609ee2d4e7d835a

Original change's description:
> Remove devKerning
> 
> Dev kerning is not supported by any scalers. This is
> mostly removed. The remaining fields fRsbDelta and
> fLsbDelta are kept to keep Android compiling.
> 
> Change-Id: If1a9ee9bb599d4e1bdf4b3751ac0c65246350809
> Reviewed-on: https://skia-review.googlesource.com/124921
> Reviewed-by: Ben Wagner <bungeman@google.com>
> Commit-Queue: Herb Derby <herb@google.com>

Change-Id: Ibf5fac5f1442c7e62392d5146ad460da27b10d5c
Reviewed-on: https://skia-review.googlesource.com/125300
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
diff --git a/src/ports/SkFontHost_mac.cpp b/src/ports/SkFontHost_mac.cpp
index efd74f6..8047c43 100644
--- a/src/ports/SkFontHost_mac.cpp
+++ b/src/ports/SkFontHost_mac.cpp
@@ -2249,8 +2249,7 @@
         rec->setHinting(SkPaint::kNormal_Hinting);
     }
 
-    unsigned flagsWeDontSupport = SkScalerContext::kDevKernText_Flag  |
-                                  SkScalerContext::kForceAutohinting_Flag  |
+    unsigned flagsWeDontSupport = SkScalerContext::kForceAutohinting_Flag  |
                                   SkScalerContext::kLCD_BGROrder_Flag |
                                   SkScalerContext::kLCD_Vertical_Flag;