Fixes for -Wunused-function on Linux, Android and ChromeOS

ui/gfx/interpolated_transform_unittest.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 "base/basictypes.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect.h"
 
 namespace {
 
 void CheckApproximatelyEqual(const gfx::Transform& lhs,
                              const gfx::Transform& rhs) {
   for (int i = 0; i < 4; ++i) {
     for (int j = 0; j < 4; ++j) {
       EXPECT_FLOAT_EQ(lhs.matrix().get(i, j), rhs.matrix().get(i, j));
     }
   }
 }
 
-float NormalizeAngle(float angle) {
-  while (angle < 0.0f) {
-    angle += 360.0f;
-  }
-  while (angle > 360.0f) {
-    angle -= 360.0f;
-  }
-  return angle;
-}
-
 } // namespace
 
 TEST(InterpolatedTransformTest, InterpolatedRotation) {
   ui::InterpolatedRotation interpolated_rotation(0, 100);
   ui::InterpolatedRotation interpolated_rotation_diff_start_end(
       0, 100, 100, 200);
 
   for (int i = 0; i <= 100; ++i) {
     gfx::Transform rotation;
     rotation.Rotate(i);
@@ skipping 183 matching lines @@
   gfx::Transform interpolated = maximize->Interpolate(1.0f);
   SkMatrix44& m = interpolated.matrix();
   // Upper-left 3x3 matrix should all be 0, 1 or -1.
   for (int row = 0; row < 3; ++row) {
     for (int col = 0; col < 3; ++col) {
       float entry = m.get(row, col);
       EXPECT_TRUE(entry == 0 || entry == 1 || entry == -1);
     }
   }
 }