Add migration code for 'Downloads' path change for multi profile support.

The actual change for the path is not happening yet,
but it is possible to add the migration code first.

BUG=309556

Review URL: https://codereview.chromium.org/52193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232272 0039d316-1c4b-4281-b951-d872f2087c98
Add value for "infobar dismissed" to the "Save password" infobar histogram.

BUG=NONE
R=markusheintz@chromium.org

Review URL: https://codereview.chromium.org/52383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232273 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232272
Reland "Enable SysInfo::AmountOfPhysicalMemory to be called from within the Linux Sandbox"

Trigger caching of SysInfo::AmountOfPhysicalMemory in PreSandboxInit() to enable
it to be called by the renderer process after the sandbox is sealed.

BUG=312241

Review URL: https://codereview.chromium.org/52403002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232274 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232274