gn/win: Try to get chrome_elf_unittests passing on swarming.
gn/win: Try to get chrome_elf_unittests passing on swarming.

It looks like the indirection in chrome/BUILD.gn that does the
out/foo/initial/chrome.exe -> out/foo/chrome.exe mananges to
confuse data_deps, so add an explicit data dep.

Follow-up to https://codereview.chromium.org/1223703002/

BUG=98637,536192
TBR=caitkp

Review URL: https://codereview.chromium.org/1701053002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#375689}

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