Small improvements to SkBitSet:

src/utils/SkBitSet.cpp

Index: src/utils/SkBitSet.cpp
diff --git a/src/utils/SkBitSet.cpp b/src/utils/SkBitSet.cpp
index 36ff6cbb01c8afcb20ad2043e12b3a53ceca82c7..63d18ff2f3d4593e3c34d4fcf147e37d68eace10 100755
--- a/src/utils/SkBitSet.cpp
+++ b/src/utils/SkBitSet.cpp
@@ -14,8 +14,7 @@ SkBitSet::SkBitSet(int numberOfBits)
     SkASSERT(numberOfBits > 0);
     // Round up size to 32-bit boundary.
     fDwordCount = (numberOfBits + 31) / 32;
-    fBitData.set(malloc(fDwordCount * sizeof(uint32_t)));
-    clearAll();
+    fBitData.set(sk_calloc_throw(fDwordCount * sizeof(uint32_t)));
 }
 
 SkBitSet::SkBitSet(const SkBitSet& source)
@@ -30,7 +29,7 @@ SkBitSet& SkBitSet::operator=(const SkBitSet& rhs) {
     fBitCount = rhs.fBitCount;
     fBitData.free();
     fDwordCount = rhs.fDwordCount;
-    fBitData.set(malloc(fDwordCount * sizeof(uint32_t)));
+    fBitData.set(sk_malloc_throw(fDwordCount * sizeof(uint32_t)));
     memcpy(fBitData.get(), rhs.fBitData.get(), fDwordCount * sizeof(uint32_t));
     return *this;
 }
@@ -56,25 +55,11 @@ void SkBitSet::clearAll() {
     }
 }
 
-void SkBitSet::setBit(int index, bool value) {
-    uint32_t mask = 1 << (index % 32);
-    if (value) {
-        *(internalGet(index)) |= mask;
-    } else {
-        *(internalGet(index)) &= ~mask;
-    }
-}
-
-bool SkBitSet::isBitSet(int index) const {
-    uint32_t mask = 1 << (index % 32);
-    return 0 != (*internalGet(index) & mask);
-}
-
 bool SkBitSet::orBits(const SkBitSet& source) {
     if (fBitCount != source.fBitCount) {
         return false;
     }
-    uint32_t* targetBitmap = internalGet(0);
+    uint32_t* targetBitmap = this->internalGet(0);
     uint32_t* sourceBitmap = source.internalGet(0);
     for (size_t i = 0; i < fDwordCount; ++i) {
         targetBitmap[i] |= sourceBitmap[i];