Fix compilation warnings for cast_unittest on Linux

media/cast/rtcp/rtcp_unittest.cc

 // Copyright 2013 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 "base/test/simple_test_tick_clock.h"
 #include "media/cast/cast_defines.h"
 #include "media/cast/pacing/paced_sender.h"
 #include "media/cast/rtcp/mock_rtcp_receiver_feedback.h"
 #include "media/cast/rtcp/mock_rtcp_sender_feedback.h"
 #include "media/cast/rtcp/rtcp.h"
@@ skipping 319 matching lines @@
   uint32 new_timestamp = 0;
   uint32 old_timestamp = 0;
   EXPECT_EQ(0, rtcp_peer.CheckForWrapAround(new_timestamp, old_timestamp));
   new_timestamp = 1234567890;
   old_timestamp = 1234567000;
   EXPECT_EQ(0, rtcp_peer.CheckForWrapAround(new_timestamp, old_timestamp));
   new_timestamp = 1234567000;
   old_timestamp = 1234567890;
   EXPECT_EQ(0, rtcp_peer.CheckForWrapAround(new_timestamp, old_timestamp));
   new_timestamp = 123;
-  old_timestamp = 4234567890;
+  old_timestamp = 4234567890u;
   EXPECT_EQ(1, rtcp_peer.CheckForWrapAround(new_timestamp, old_timestamp));
-  new_timestamp = 4234567890;
+  new_timestamp = 4234567890u;
   old_timestamp = 123;
   EXPECT_EQ(-1, rtcp_peer.CheckForWrapAround(new_timestamp, old_timestamp));
 }
 
 TEST_F(RtcpTest, RtpTimestampInSenderTime) {
   RtcpPeer rtcp_peer(&mock_sender_feedback_,
                      NULL,
                      NULL,
                      NULL,
                      kRtcpReducedSize,
@@ skipping 23 matching lines @@
   EXPECT_EQ(input_time, rtp_timestamp_in_ticks);
 
   // Test older rtp_timestamp.
   rtp_timestamp = 32000;
   EXPECT_TRUE(rtcp_peer.RtpTimestampInSenderTime(frequency, rtp_timestamp,
                                                   &rtp_timestamp_in_ticks));
   EXPECT_EQ(input_time - base::TimeDelta::FromMilliseconds(1000),
             rtp_timestamp_in_ticks);
 
   // Test older rtp_timestamp with wrap.
-  rtp_timestamp = 4294903296;
+  rtp_timestamp = 4294903296u;
   EXPECT_TRUE(rtcp_peer.RtpTimestampInSenderTime(frequency, rtp_timestamp,
                                                   &rtp_timestamp_in_ticks));
   EXPECT_EQ(input_time - base::TimeDelta::FromMilliseconds(4000),
             rtp_timestamp_in_ticks);
 
   // Test newer rtp_timestamp.
   rtp_timestamp = 128000;
   EXPECT_TRUE(rtcp_peer.RtpTimestampInSenderTime(frequency, rtp_timestamp,
                                                   &rtp_timestamp_in_ticks));
   EXPECT_EQ(input_time + base::TimeDelta::FromMilliseconds(2000),
             rtp_timestamp_in_ticks);
 
   // Test newer rtp_timestamp with wrap.
-  rtp_timestamp = 4294903296;
+  rtp_timestamp = 4294903296u;
   rtcp_peer.OnReceivedLipSyncInfo(rtp_timestamp, ntp_seconds, ntp_fractions);
   rtp_timestamp = 64000;
   EXPECT_TRUE(rtcp_peer.RtpTimestampInSenderTime(frequency, rtp_timestamp,
                                                   &rtp_timestamp_in_ticks));
   EXPECT_EQ(input_time + base::TimeDelta::FromMilliseconds(4000),
             rtp_timestamp_in_ticks);
 }
 
 }  // namespace cast
 }  // namespace media