Cast: Fix use after free in a testing tool
Cast: Fix use after free in a testing tool

cast_simulator should call .Pass() to pass the PacketPipe for
simulation.

TBR=miu

Review URL: https://codereview.chromium.org/463373003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@289226 0039d316-1c4b-4281-b951-d872f2087c98

ondra-novak/chromium.src,bright-sparks/chromium-spacewalk,littlstar/chromium.src,ondra-novak/chromium.src,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,bright-sparks/chromium-spacewalk,littlstar/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,littlstar/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,littlstar/chromium.src,littlstar/chromium.src,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,bright-sparks/chromium-spacewalk,littlstar/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src