TODO: remove armv7 setting

Leave a TODO note in build/common.gypi to remove this obsolete armv7
setting, once all uses of it are removed.

BUG=234135

Review URL: https://codereview.chromium.org/103203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238643 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238643
Don't deserialize empty TransportSecurityStates.

BUG=323951
TEST=No more "Failed to deserialize state: " warnings for empty strings.
Non-empty but malformed strings should still cause warnings.

Review URL: https://codereview.chromium.org/103213003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238644 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238644