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what happens is that we use vector_as_array(&data) which returns null if data is empty, but we don't check |size| whichcan be 0 so data.resize(size) still an empty vector.

This is currently happening for browser_tests.exe in the waterfall.

There might be a better fix but lots of tests are having exceptions so I want to stop that.

TBR=mnissler
BUG=none
TEST=logs are clean

Review URL: https://codereview.chromium.org/23961004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222177 0039d316-1c4b-4281-b951-d872f2087c98