Update audio code to use size_t more correctly, webrtc/common_audio/ portion.

webrtc/common_audio/real_fourier_unittest.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 28 matching lines @@
 }
 
 TEST(RealFourierStaticsTest, OrderComputation) {
   EXPECT_EQ(4, RealFourier::FftOrder(13));
   EXPECT_EQ(5, RealFourier::FftOrder(32));
   EXPECT_EQ(1, RealFourier::FftOrder(2));
   EXPECT_EQ(0, RealFourier::FftOrder(1));
 }
 
 TEST(RealFourierStaticsTest, ComplexLengthComputation) {
-  EXPECT_EQ(2, RealFourier::ComplexLength(1));
-  EXPECT_EQ(3, RealFourier::ComplexLength(2));
-  EXPECT_EQ(5, RealFourier::ComplexLength(3));
-  EXPECT_EQ(9, RealFourier::ComplexLength(4));
-  EXPECT_EQ(17, RealFourier::ComplexLength(5));
-  EXPECT_EQ(65, RealFourier::ComplexLength(7));
+  EXPECT_EQ(2U, RealFourier::ComplexLength(1));
+  EXPECT_EQ(3U, RealFourier::ComplexLength(2));
+  EXPECT_EQ(5U, RealFourier::ComplexLength(3));
+  EXPECT_EQ(9U, RealFourier::ComplexLength(4));
+  EXPECT_EQ(17U, RealFourier::ComplexLength(5));
+  EXPECT_EQ(65U, RealFourier::ComplexLength(7));
 }
 
 template <typename T>
 class RealFourierTest : public ::testing::Test {
  protected:
   RealFourierTest()
       : rf_(2),
         real_buffer_(RealFourier::AllocRealBuffer(4)),
         cplx_buffer_(RealFourier::AllocCplxBuffer(3)) {}
 
@@ skipping 36 matching lines @@
   this->rf_.Inverse(this->cplx_buffer_.get(), this->real_buffer_.get());
 
   EXPECT_NEAR(this->real_buffer_[0], 1.0f, 1e-8f);
   EXPECT_NEAR(this->real_buffer_[1], 2.0f, 1e-8f);
   EXPECT_NEAR(this->real_buffer_[2], 3.0f, 1e-8f);
   EXPECT_NEAR(this->real_buffer_[3], 4.0f, 1e-8f);
 }
 
 }  // namespace webrtc