Remove IFGAS_FontMgr and clean up (the renamed) CFGAS_FontMgr a little.

xfa/fxfa/app/xfa_textlayout.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fxfa/app/xfa_textlayout.h"
 
 #include <algorithm>
 
@@ skipping 76 matching lines @@
   }
   m_mapXMLNodeToParseContext.RemoveAll();
   m_pAllocator.reset();
 }
 void CXFA_TextParser::InitCSSData(CXFA_TextProvider* pTextProvider) {
   if (!pTextProvider)
     return;
 
   if (!m_pSelector) {
     CXFA_FFDoc* pDoc = pTextProvider->GetDocNode();
-    IFGAS_FontMgr* pFontMgr = pDoc->GetApp()->GetFDEFontMgr();
+    CFGAS_FontMgr* pFontMgr = pDoc->GetApp()->GetFDEFontMgr();
     ASSERT(pFontMgr);
     m_pSelector.reset(new CFDE_CSSStyleSelector(pFontMgr));
     FX_FLOAT fFontSize = 10;
     CXFA_Font font = pTextProvider->GetFontNode();
     if (font) {
       fFontSize = font.GetFontSize();
     }
     m_pSelector->SetDefFontSize(fFontSize);
   }
   if (!m_pUASheet) {
@@ skipping 1986 matching lines @@
   m_tabstops.RemoveAll();
   m_iTabCount = 0;
 }
 
 void CXFA_TextTabstopsContext::Reset() {
   m_iTabIndex = -1;
   m_bTabstops = false;
   m_fTabWidth = 0;
   m_fLeft = 0;
 }