Used new --minified flag for dart2dart compilations.
Used new --minified flag for dart2dart compilations.

TBR=foo

Review URL: https://chromiumcodereview.appspot.com/11308122

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@168784 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build