Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
diff --git a/src/core/SkBitmapCache.cpp b/src/core/SkBitmapCache.cpp
index 66075d4..2b11b81 100644
--- a/src/core/SkBitmapCache.cpp
+++ b/src/core/SkBitmapCache.cpp
@@ -202,7 +202,7 @@
         const SkMipMap* mm = SkRef(rec.fMipMap);
         // the call to ref() above triggers a "lock" in the case of discardable memory,
         // which means we can now check for null (in case the lock failed).
-        if (NULL == mm->data()) {
+        if (nullptr == mm->data()) {
             mm->unref();    // balance our call to ref()
             return false;
         }
@@ -222,7 +222,7 @@
     const SkMipMap* result;
 
     if (!CHECK_LOCAL(localCache, find, Find, key, MipMapRec::Finder, &result)) {
-        result = NULL;
+        result = nullptr;
     }
     return result;
 }