Update PEM file to write a key with 64 characters per line

Update generated private key file (PEM file) for packaged apps to have 64 characters per line, in accordance with RFC 1421.

BUG=331791

Review URL: https://codereview.chromium.org/153193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248945 0039d316-1c4b-4281-b951-d872f2087c98
Allow BITS downloads of components only in certain cases.

agl@, I need an owner review for the crlset change.

BITS download is broken when the download is hosted by certain serving backends. Until the range support is improved, BITS can be used only in some cases.

For full downloads, everything uses BITS but CRLSet.
For diff downloads, nothing uses BITS

BUG=340450

Review URL: https://codereview.chromium.org/131453006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248946 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248946