[NOT FOR REVIEW] Convert channel counts to size_t.

talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc

Index: talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc
diff --git a/talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc b/talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc
index 9aac44602da2363a6d4c8aaa2a7b3402a9d4251f..17adeb11280d72646ee3e1f3347d8a66c2f1fb53 100644
--- a/talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc
+++ b/talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc
@@ -58,7 +58,7 @@ class FakeAdmTest : public testing::Test,
   int32_t RecordedDataIsAvailable(const void* audioSamples,
                                   const size_t nSamples,
                                   const size_t nBytesPerSample,
-                                  const uint8_t nChannels,
+                                  const size_t nChannels,
                                   const uint32_t samplesPerSec,
                                   const uint32_t totalDelayMS,
                                   const int32_t clockDrift,
@@ -81,7 +81,7 @@ class FakeAdmTest : public testing::Test,
   // ADM is pulling data.
   int32_t NeedMorePlayData(const size_t nSamples,
                            const size_t nBytesPerSample,
-                           const uint8_t nChannels,
+                           const size_t nChannels,
                            const uint32_t samplesPerSec,
                            void* audioSamples,
                            size_t& nSamplesOut,