Replace HashMap with SparseArray in UsbMidiDeviceAndroid.java.

Android lint suggests replacing HashMap<Integer, Xyz> with
SparseArray<Xyz> for better memory efficiency.

BUG=347356
NOTRY=true

Review URL: https://codereview.chromium.org/181593009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254583 0039d316-1c4b-4281-b951-d872f2087c98
Fix the order of commandline flag.

Accidentally, the commandline flag (--allow-loopback-in-peer-connection)
was put in the wrong order.

BUG=346721

TBR=creis@chromium.org

Review URL: https://codereview.chromium.org/185863005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254584 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254584