gn/win: Temporarily remove data dep on np_test_netscape_plugin.dll
gn/win: Temporarily remove data dep on np_test_netscape_plugin.dll

Nothing creates this file yet in the gyp build, so this line makes
isolate_tests fail.

BUG=498033
TBR=dpranke

Review URL: https://codereview.chromium.org/1682853005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#374892}

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