Fix packetization logic to leave space for extensions in the last packet

webrtc/modules/rtp_rtcp/source/rtp_format_vp8_test_helper.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_format_vp8_test_helper.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_format_vp8_test_helper.cc b/webrtc/modules/rtp_rtcp/source/rtp_format_vp8_test_helper.cc
index 8b20aebb90aff7e11ae60b690eaf2c172053689b..9b08f05e8113155b5107f4d4115fc4d62760f7aa 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_format_vp8_test_helper.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_format_vp8_test_helper.cc
@@ -68,15 +68,14 @@ void RtpFormatVp8TestHelper::GetAllPacketsAndCheck(
     const bool* expected_frag_start,
     size_t expected_num_packets) {
   ASSERT_TRUE(inited_);
-  bool last = false;
   for (size_t i = 0; i < expected_num_packets; ++i) {
     std::ostringstream ss;
     ss << "Checking packet " << i;
     SCOPED_TRACE(ss.str());
-    EXPECT_TRUE(packetizer->NextPacket(&packet_, &last));
-    CheckPacket(expected_sizes[i], last, expected_frag_start[i]);
+    EXPECT_TRUE(packetizer->NextPacket(&packet_));
+    CheckPacket(expected_sizes[i], i + 1 == expected_num_packets,
+                expected_frag_start[i]);
   }
-  EXPECT_TRUE(last);
 }
 
 // Payload descriptor