Update breakpad to refer to libtest_netscape_plugin.so

libTestNetscapePlugIn.so has been renamed to libtest_netscape_plugin.so, sync.

R=jochen@chromium.org
BUG=341016

Review URL: https://codereview.chromium.org/146913007

git-svn-id: svn://svn.chromium.org/blink/trunk@166515 bbb929c8-8fbe-4397-9dbb-9b2b20218538