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An browser test which cover whole translate process was disabled tentatively.
This is because now Translate scripts runs inside a v8 isolated world and
it make impossible to run with local testing server.
This change introduce a flag to change the allowed server for XHR, and
make the test enabled again.
Note that this flag is warned by infobar when it is enabled.

BUG=268785
TEST=browser_tests --gtest_filter='Translate*.*'
TBR=hajimehoshi@chromium.org

Review URL: https://chromiumcodereview.appspot.com/14180010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@215912 0039d316-1c4b-4281-b951-d872f2087c98