Rename xfa_utils_imp to xfa_utils

xfa/fxfa/parser/xfa_utils_imp_unittest.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.
-
-#include "testing/gtest/include/gtest/gtest.h"
-#include "xfa/fxfa/parser/xfa_utils.h"
-
-TEST(XfaUtilsImp, XFA_MapRotation) {
-  struct TestCase {
-    int input;
-    int expected_output;
-  } TestCases[] = {{-1000000, 80}, {-361, 359}, {-360, 0},  {-359, 1},
-                   {-91, 269},     {-90, 270},  {-89, 271}, {-1, 359},
-                   {0, 0},         {1, 1},      {89, 89},   {90, 90},
-                   {91, 91},       {359, 359},  {360, 0},   {361, 1},
-                   {100000, 280}};
-
-  for (size_t i = 0; i < FX_ArraySize(TestCases); ++i) {
-    EXPECT_EQ(TestCases[i].expected_output,
-              XFA_MapRotation(TestCases[i].input));
-  }
-}