Fix more code which has shadow variables

core/fxcrt/fx_basic_coords.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 <limits.h>
 
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxcrt/include/fx_ext.h"
@@ skipping 266 matching lines @@
                                 const CFX_Matrix& m1,
                                 const CFX_Matrix& m2) {
   FX_FLOAT aa = m1.a * m2.a + m1.b * m2.c;
   FX_FLOAT bb = m1.a * m2.b + m1.b * m2.d;
   FX_FLOAT cc = m1.c * m2.a + m1.d * m2.c;
   FX_FLOAT dd = m1.c * m2.b + m1.d * m2.d;
   FX_FLOAT ee = m1.e * m2.a + m1.f * m2.c + m2.e;
   FX_FLOAT ff = m1.e * m2.b + m1.f * m2.d + m2.f;
   m.a = aa, m.b = bb, m.c = cc, m.d = dd, m.e = ee, m.f = ff;
 }
-void CFX_Matrix::Concat(FX_FLOAT a,
-                        FX_FLOAT b,
-                        FX_FLOAT c,
-                        FX_FLOAT d,
-                        FX_FLOAT e,
-                        FX_FLOAT f,
+void CFX_Matrix::Concat(FX_FLOAT a_in,
+                        FX_FLOAT b_in,
+                        FX_FLOAT c_in,
+                        FX_FLOAT d_in,
+                        FX_FLOAT e_in,
+                        FX_FLOAT f_in,
                         FX_BOOL bPrepended) {
   CFX_Matrix m;
-  m.Set(a, b, c, d, e, f);
+  m.Set(a_in, b_in, c_in, d_in, e_in, f_in);
   Concat(m, bPrepended);
 }
 void CFX_Matrix::Concat(const CFX_Matrix& m, FX_BOOL bPrepended) {
   if (bPrepended) {
     FXCRT_Matrix_Concat(*this, m, *this);
   } else {
     FXCRT_Matrix_Concat(*this, *this, m);
   }
 }
 void CFX_Matrix::ConcatInverse(const CFX_Matrix& src, FX_BOOL bPrepended) {
@@ skipping 202 matching lines @@
       left = x[i];
     }
     if (top < y[i]) {
       top = y[i];
     }
     if (bottom > y[i]) {
       bottom = y[i];
     }
   }
 }