Fix an IPC fuzzer compile failure.
Fix an IPC fuzzer compile failure.

cc::ScopedPtrVector was removed and replaced with std::vector<scoped_ptr>, but the IPC fuzzer was not updated to account for this change.

R=inferno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1456073002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#360365}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk