low hanging calloc fruit

BUG=
R=reed@google.com

Review URL: https://codereview.chromium.org/24267014

git-svn-id: http://skia.googlecode.com/svn/trunk/src@11423 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/core/SkBitmap.cpp b/core/SkBitmap.cpp
index d3bbecd..dcc7b2e 100644
--- a/core/SkBitmap.cpp
+++ b/core/SkBitmap.cpp
@@ -1632,8 +1632,7 @@
 
 SkBitmap::RLEPixels::RLEPixels(int width, int height) {
     fHeight = height;
-    fYPtrs = (uint8_t**)sk_malloc_throw(height * sizeof(uint8_t*));
-    sk_bzero(fYPtrs, height * sizeof(uint8_t*));
+    fYPtrs = (uint8_t**)sk_calloc_throw(height * sizeof(uint8_t*));
 }
 
 SkBitmap::RLEPixels::~RLEPixels() {
diff --git a/core/SkTDynamicHash.h b/core/SkTDynamicHash.h
index 47412c3..4cb4420 100644
--- a/core/SkTDynamicHash.h
+++ b/core/SkTDynamicHash.h
@@ -92,9 +92,7 @@
     static T* Deleted() { return reinterpret_cast<T*>(1); }  // Also an invalid pointer.
 
     static T** AllocArray(int capacity) {
-        T** array = (T**)sk_malloc_throw(sizeof(T*) * capacity);
-        sk_bzero(array, sizeof(T*) * capacity);  // All cells == Empty().
-        return array;
+        return (T**)sk_calloc_throw(sizeof(T*) * capacity);  // All cells == Empty().
     }
 
     void reset(int capacity) {