Revert "Correct variable name typo while accessing TimelineViewport object from TimelineTrackView object."
Revert "Correct variable name typo while accessing TimelineViewport object from TimelineTrackView object."

This reverts commit bc297618ab340ca6f4234a58828f7350e6c8e5bd.

Comments on https://codereview.appspot.com/118960043/#msg7

git-svn-id: 3a56fcae908c7e16d23cb53443ea4795ac387cf2@1411 0e6d7f2b-9903-5b78-7403-59d27f066143

bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer