mac: Prepare for -Wunused-functions.

ui/gfx/interpolated_transform.cc

 // Copyright (c) 2012 The Chromium 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 "ui/gfx/interpolated_transform.h"
 
 #include <cmath>
 
 #ifndef M_PI
 #define M_PI 3.14159265358979323846
 #endif
 
 #include "base/logging.h"
 #include "ui/gfx/animation/tween.h"
 
 namespace {
 
 static const double EPSILON = 1e-6;
 
 bool IsMultipleOfNinetyDegrees(double degrees) {
   double remainder = fabs(fmod(degrees, 90.0));
   return remainder < EPSILON || 90.0 - remainder < EPSILON;
 }
 
-bool IsApproximatelyZero(double value) {
-  return fabs(value) < EPSILON;
-}
-
 // Returns false if |degrees| is not a multiple of ninety degrees or if
 // |rotation| is NULL. It does not affect |rotation| in this case. Otherwise
 // *rotation is set to be the appropriate sanitized rotation matrix. That is,
 // the rotation matrix corresponding to |degrees| which has entries that are all
 // either 0, 1 or -1.
 bool MassageRotationIfMultipleOfNinetyDegrees(gfx::Transform* rotation,
                                               float degrees) {
   if (!IsMultipleOfNinetyDegrees(degrees) || !rotation)
     return false;
 
@@ skipping 326 matching lines @@
 
 void InterpolatedMatrixTransform::Init(const gfx::Transform& start_transform,
                                        const gfx::Transform& end_transform) {
   bool success = gfx::DecomposeTransform(&start_decomp_, start_transform);
   DCHECK(success);
   success = gfx::DecomposeTransform(&end_decomp_, end_transform);
   DCHECK(success);
 }
 
 } // namespace ui