Tidy CFGAS_DefaultFontManager::GetDefaultFont().

-- Remove unused parameter.
-- Use early return.
-- no need to cast nullptr.

Change-Id: Id155301b9ff2283f0eae3c0ec52362cee0b3a03b
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/66632
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/xfa/fgas/font/cfgas_defaultfontmanager.cpp b/xfa/fgas/font/cfgas_defaultfontmanager.cpp
index 239dfa7..4115b7b 100644
--- a/xfa/fgas/font/cfgas_defaultfontmanager.cpp
+++ b/xfa/fgas/font/cfgas_defaultfontmanager.cpp
@@ -57,13 +57,11 @@
 // static
 RetainPtr<CFGAS_GEFont> CFGAS_DefaultFontManager::GetDefaultFont(
     CFGAS_FontMgr* pFontMgr,
-    WideStringView wsFontFamily,
     uint32_t dwFontStyles) {
   RetainPtr<CFGAS_GEFont> pFont =
       pFontMgr->LoadFont(L"Arial Narrow", dwFontStyles, 0xFFFF);
-  if (!pFont) {
-    pFont = pFontMgr->LoadFont(static_cast<const wchar_t*>(nullptr),
-                               dwFontStyles, 0xFFFF);
-  }
-  return pFont;
+  if (pFont)
+    return pFont;
+
+  return pFontMgr->LoadFont(nullptr, dwFontStyles, 0xFFFF);
 }
diff --git a/xfa/fgas/font/cfgas_defaultfontmanager.h b/xfa/fgas/font/cfgas_defaultfontmanager.h
index ebf2f3c..32fb372 100644
--- a/xfa/fgas/font/cfgas_defaultfontmanager.h
+++ b/xfa/fgas/font/cfgas_defaultfontmanager.h
@@ -19,7 +19,6 @@
                                          WideStringView wsFontFamily,
                                          uint32_t dwFontStyles);
   static RetainPtr<CFGAS_GEFont> GetDefaultFont(CFGAS_FontMgr* pFontMgr,
-                                                WideStringView wsFontFamily,
                                                 uint32_t dwFontStyles);
 
   CFGAS_DefaultFontManager() = delete;
diff --git a/xfa/fxfa/cxfa_fontmgr.cpp b/xfa/fxfa/cxfa_fontmgr.cpp
index 7259f6cf..b3bbd82 100644
--- a/xfa/fxfa/cxfa_fontmgr.cpp
+++ b/xfa/fxfa/cxfa_fontmgr.cpp
@@ -52,7 +52,7 @@
   }
   if (!pFont) {
     pFont = CFGAS_DefaultFontManager::GetDefaultFont(
-        hDoc->GetApp()->GetFDEFontMgr(), wsFontFamily, dwFontStyles);
+        hDoc->GetApp()->GetFDEFontMgr(), dwFontStyles);
   }
   if (!pFont) {
     pFont = CFGAS_GEFont::LoadStockFont(