net: add (*.)www.heliosnet.com to HSTS preloaded.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243324 0039d316-1c4b-4281-b951-d872f2087c98
Test Keeping NaCl plugins used in app background pages alive when active.

(Re-landing with fixes from https://codereview.chromium.org/112663007/ )

Activity in Native Client plugins results in IPC messages
sent to the BrowserPpapiHostImpl and routed to call
extensions::ProcessManager::KeepaliveImpulse.

Testing patch, builds on implementation:
https://codereview.chromium.org/61063003/

Design doc:
https://docs.google.com/a/chromium.org/document/d/1mI0lS1rfAf-BAGLmWAEcWy37Xq9dOvgfMx8OqeUMXts/edit#

BUG=298339
No change to mseaborn owned file since last LGTM:

R=yzshen@chromium.org
TBR=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/125353006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243326 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243326