remove cruft from SkTypes.h, including SkBool

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1548223002

TBR=

Review URL: https://codereview.chromium.org/1548223002
diff --git a/include/core/SkTypes.h b/include/core/SkTypes.h
index 261fcae..c112b03 100644
--- a/include/core/SkTypes.h
+++ b/include/core/SkTypes.h
@@ -248,12 +248,6 @@
 typedef unsigned U16CPU;
 
 /**
- *  Meant to be faster than bool (doesn't promise to be 0 or 1,
- *  just 0 or non-zero
- */
-typedef int SkBool;
-
-/**
  *  Meant to be a small version of bool, for storage purposes. Will be 0 or 1
  */
 typedef uint8_t SkBool8;
@@ -441,17 +435,6 @@
     return SkTMax(SkTMin(value, max), min);
 }
 
-static inline uint32_t SkSetClearShift(uint32_t bits, bool cond,
-                                       unsigned shift) {
-    SkASSERT((int)cond == 0 || (int)cond == 1);
-    return (bits & ~(1 << shift)) | ((int)cond << shift);
-}
-
-static inline uint32_t SkSetClearMask(uint32_t bits, bool cond,
-                                      uint32_t mask) {
-    return cond ? bits | mask : bits & ~mask;
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 
 /** Use to combine multiple bits in a bitmask in a type safe way.
diff --git a/include/utils/SkInterpolator.h b/include/utils/SkInterpolator.h
index 18203d0..9547cec 100644
--- a/include/utils/SkInterpolator.h
+++ b/include/utils/SkInterpolator.h
@@ -59,7 +59,7 @@
         fFlags = SkToU8((fFlags & ~kReset) | (int)reset);
     }
 
-    Result  timeToT(SkMSec time, SkScalar* T, int* index, SkBool* exact) const;
+    Result  timeToT(SkMSec time, SkScalar* T, int* index, bool* exact) const;
 
 protected:
     enum Flags {