Revert "By default use current code page on Windows for decoding string"
Revert "By default use current code page on Windows for decoding string"

This reverts commit c247cd299958d0ee713dcfef8aaf44d230a3a7e0.

Revert "Fix memory leaks in system string patch"

This reverts commit 5e533a0c383518fc1851fbdc01a796f7d6b077f8.

Review URL: https://codereview.chromium.org//11446067

git-svn-id: a962b240025cf0577aa172e20f49ccb159ba6be1@15854 260f80e4-7a28-3924-810f-c04153c831b5

cjkao/dart-pub,computmaxer/pub,dart-lang/pub,dart-lang/pub,maxwellpeterson-wf/pub