Match existing type usage better.

talk/app/webrtc/test/fakeaudiocapturemodule.cc

Index: talk/app/webrtc/test/fakeaudiocapturemodule.cc
diff --git a/talk/app/webrtc/test/fakeaudiocapturemodule.cc b/talk/app/webrtc/test/fakeaudiocapturemodule.cc
index c6339d3c3f4295d88b6b45abc41cb55a8943fe11..e52b686bc23415b5b8cca75249d2a5290393368e 100644
--- a/talk/app/webrtc/test/fakeaudiocapturemodule.cc
+++ b/talk/app/webrtc/test/fakeaudiocapturemodule.cc
@@ -45,7 +45,7 @@ static const uint32 kAdmMaxIdleTimeProcess = 1000;
 // Constants here are derived by running VoE using a real ADM.
 // The constants correspond to 10ms of mono audio at 44kHz.
 static const int kTimePerFrameMs = 10;
-static const int kNumberOfChannels = 1;
+static const uint8_t kNumberOfChannels = 1;
 static const int kSamplesPerSecond = 44000;
 static const int kTotalDelayMs = 0;
 static const int kClockDriftMs = 0;