Remove unused parameter "stream" from all variants of OnMoreData().

media/audio/linux/alsa_output_unittest.cc

Index: media/audio/linux/alsa_output_unittest.cc
===================================================================
--- media/audio/linux/alsa_output_unittest.cc	(revision 133451)
+++ media/audio/linux/alsa_output_unittest.cc	(working copy)
@@ -69,8 +69,7 @@
 
 class MockAudioSourceCallback : public AudioOutputStream::AudioSourceCallback {
  public:
-  MOCK_METHOD4(OnMoreData, uint32(AudioOutputStream* stream,
-                                  uint8* dest, uint32 max_size,
+  MOCK_METHOD3(OnMoreData, uint32(uint8* dest, uint32 max_size,
                                   AudioBuffersState buffers_state));
   MOCK_METHOD2(OnError, void(AudioOutputStream* stream, int code));
 };
@@ -440,8 +439,7 @@
   EXPECT_CALL(mock_alsa_wrapper_, PcmDelay(kFakeHandle, _))
       .Times(2)
       .WillRepeatedly(DoAll(SetArgumentPointee<1>(0), Return(0)));
-  EXPECT_CALL(mock_callback,
-              OnMoreData(test_stream, _, kTestPacketSize, _))
+  EXPECT_CALL(mock_callback, OnMoreData(_, kTestPacketSize, _))
       .Times(2)
       .WillOnce(Return(kTestPacketSize))
       .WillOnce(Return(0));
@@ -559,8 +557,7 @@
       .WillRepeatedly(Return(0));  // Buffer is full.
 
   // Return a partially filled packet.
-  EXPECT_CALL(mock_callback,
-              OnMoreData(test_stream, _, _, _))
+  EXPECT_CALL(mock_callback, OnMoreData(_, _, _))
       .WillOnce(Return(10));
 
   bool source_exhausted;
@@ -586,7 +583,7 @@
       .WillOnce(DoAll(SetArgumentPointee<1>(-1), Return(0)));
   EXPECT_CALL(mock_alsa_wrapper_, PcmAvailUpdate(_))
       .WillRepeatedly(Return(0));  // Buffer is full.
-  EXPECT_CALL(mock_callback, OnMoreData(test_stream, _, _, _))
+  EXPECT_CALL(mock_callback, OnMoreData(_, _, _))
       .WillOnce(Return(10));
 
   bool source_exhausted;
@@ -611,7 +608,7 @@
   EXPECT_CALL(mock_alsa_wrapper_, PcmAvailUpdate(_))
       .WillRepeatedly(Return(0));  // Buffer is full.
   EXPECT_CALL(mock_callback,
-              OnMoreData(test_stream, _, _, AllOf(
+              OnMoreData(_, _, AllOf(
                   Field(&AudioBuffersState::pending_bytes, 0),
                   Field(&AudioBuffersState::hardware_delay_bytes, 0))))
       .WillOnce(Return(10));