Remove abs() use in PseudoTcp::process.
Remove abs() use in PseudoTcp::process.

Squelches a clang 3.5 compile error for using abs() with a long instead
of labs(). Updated affected code to use uint32:s to match the sign of
m_rx_srtt.

BUG=
R=fischman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/9409004

git-svn-id: a556c8bde68cedbc0208a1ffc78b06e9cd07f676@5651 4adac7df-926f-26a2-2b94-8c16560cd09d

bpsinc-native/src_third_party_libjingle_source_talk,dcpang/fatline-libjingle,android-ia/platform_external_chromium_org_third_party_libjingle_source_talk,android-ia/platform_external_chromium_org_third_party_libjingle_source_talk,android-ia/platform_external_chromium_org_third_party_libjingle_source_talk,geekboxzone/lollipop_external_chromium_org_third_party_libjingle_source_talk,Omegaphora/external_chromium_org_third_party_libjingle_source_talk,sippet/talk,sippet/talk,sippet/talk,Omegaphora/external_chromium_org_third_party_libjingle_source_talk,xin3liang/platform_external_chromium_org_third_party_libjingle_source_talk,xin3liang/platform_external_chromium_org_third_party_libjingle_source_talk,bpsinc-native/src_third_party_libjingle_source_talk,Omegaphora/external_chromium_org_third_party_libjingle_source_talk,AOSPU/external_chromium_org_third_party_libjingle_source_talk,geekboxzone/lollipop_external_chromium_org_third_party_libjingle_source_talk,dcpang/fatline-libjingle,AOSPU/external_chromium_org_third_party_libjingle_source_talk,Omegaphora/external_chromium_org_third_party_libjingle_source_talk,Omegaphora/external_chromium_org_third_party_libjingle_source_talk,dcpang/fatline-libjingle,Omegaphora/external_chromium_org_third_party_libjingle_source_talk,geekboxzone/lollipop_external_chromium_org_third_party_libjingle_source_talk,AOSPU/external_chromium_org_third_party_libjingle_source_talk,xin3liang/platform_external_chromium_org_third_party_libjingle_source_talk,android-ia/platform_external_chromium_org_third_party_libjingle_source_talk,android-ia/platform_external_chromium_org_third_party_libjingle_source_talk,xin3liang/platform_external_chromium_org_third_party_libjingle_source_talk,sippet/talk,AOSPU/external_chromium_org_third_party_libjingle_source_talk,sippet/talk,AOSPU/external_chromium_org_third_party_libjingle_source_talk,bpsinc-native/src_third_party_libjingle_source_talk,dcpang/fatline-libjingle,dcpang/fatline-libjingle,xin3liang/platform_external_chromium_org_third_party_libjingle_source_talk,android-ia/platform_external_chromium_org_third_party_libjingle_source_talk,geekboxzone/lollipop_external_chromium_org_third_party_libjingle_source_talk,bpsinc-native/src_third_party_libjingle_source_talk,bpsinc-native/src_third_party_libjingle_source_talk,bpsinc-native/src_third_party_libjingle_source_talk,geekboxzone/lollipop_external_chromium_org_third_party_libjingle_source_talk