Removing GrAutoMalloc

BUG=skia:

Review URL: https://codereview.chromium.org/1161993003
diff --git a/src/gpu/GrBatchFontCache.cpp b/src/gpu/GrBatchFontCache.cpp
index 2d6213c..39c6d5a 100644
--- a/src/gpu/GrBatchFontCache.cpp
+++ b/src/gpu/GrBatchFontCache.cpp
@@ -217,7 +217,7 @@
     int bytesPerPixel = GrMaskFormatBytesPerPixel(glyph->fMaskFormat);
 
     size_t size = glyph->fBounds.area() * bytesPerPixel;
-    GrAutoMalloc<1024> storage(size);
+    SkAutoSMalloc<1024> storage(size);
 
     if (GrGlyph::kDistance_MaskStyle == GrGlyph::UnpackMaskStyle(glyph->fPackedID)) {
         if (!scaler->getPackedGlyphDFImage(glyph->fPackedID, glyph->width(),