Fix a few more warnings in chromium_code mode.

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 9985f06dc6e6eed97cb01763e97e1cf0be11df91..2dd2911e932d4370eda6673d788dbf7ddbfc862a 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
@@ -685,7 +685,7 @@ CPDF_Font* CPDF_Document::AddMacFont(CTFontRef pFont, FX_BOOL bVert, FX_BOOL bTr
             pBaseDict->SetAtName(FX_BSTRC("Encoding"), "WinAnsiEncoding");
         } else {
             flags |= PDFFONT_NONSYMBOLIC;
-            int i;
+            size_t i;
             for (i = 0; i < sizeof g_FX_CharsetUnicodes / sizeof(FX_CharsetUnicodes); i ++) {
                 charSets.RemoveAll();
                 charSets.Add(g_FX_CharsetUnicodes[i].m_Charset);
@@ -913,7 +913,7 @@ CPDF_Font* CPDF_Document::AddFont(CFX_Font* pFont, int charset, FX_BOOL bVert)
             }
         } else {
             flags |= PDFFONT_NONSYMBOLIC;
-            int i;
+            size_t i;
             for (i = 0; i < sizeof g_FX_CharsetUnicodes / sizeof(FX_CharsetUnicodes); i ++)
                 if (g_FX_CharsetUnicodes[i].m_Charset == charset) {
                     break;