Restructure sandbox code to reduce dependencies pulled in by intercept code.

BUG=322710
TEST=NONE

Review URL: https://codereview.chromium.org/84063004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238538 0039d316-1c4b-4281-b951-d872f2087c98
Cache ntdll proc addresses in ELF

BUG=

Review URL: https://codereview.chromium.org/85403005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238539 0039d316-1c4b-4281-b951-d872f2087c98
Use WiFi.Frequency property to set desired band for networkingPrivateApi.StartConnect().

BUG=267667

Review URL: https://codereview.chromium.org/86123003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238540 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238539
ImportDefault, ImportBookmarksFile and ImportNothingAndShowNewTabPage tests are failing consistently on official MacOSX builder. Disabling it for now until it is fixed to keep the official bot green.

BUG=314221

Review URL: https://codereview.chromium.org/88953002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238541 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238541