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Now that translate.js runs in an isolated world, it is safe to expose
API key as an isolated world global variable.
Of course, reusing this key outside Chrome is not permitted if it's possible:)

BUG=none
TEST=browser_tests --gtest_filter='Translate*.*'

Review URL: https://chromiumcodereview.appspot.com/22645015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@217777 0039d316-1c4b-4281-b951-d872f2087c98