Review and cleanup lint warnings.

core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp

Index: core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
index 8b1571a4962547831a8f2b2fef7ecdd513328dbc..df9c13714d6f4889ce829f62f02e5520fb14cacb 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
@@ -771,10 +771,12 @@ CPDF_Font* CPDF_Document::AddMacFont(CTFontRef pFont,
   pFontDesc->SetAtInteger("CapHeight", capheight);
   CGFloat fStemV = 0;
   int16_t min_width = SHRT_MAX;
+
   static const UniChar stem_chars[] = {'i', 'I', '!', '1'};
-  const size_t count = sizeof(stem_chars) / sizeof(stem_chars[0]);
-  CGGlyph glyphs[count];
-  CGRect boundingRects[count];
+  CGGlyph glyphs[FX_ArraySize(stem_chars)];
+  CGRect boundingRects[FX_ArraySize(stem_chars)];
+
+  const size_t count = FX_ArraySize(stem_chars);
   if (CTFontGetGlyphsForCharacters(font, stem_chars, glyphs, count)) {
     CTFontGetBoundingRectsForGlyphs(font, kCTFontHorizontalOrientation, glyphs,
                                     boundingRects, count);