Revert "Update the tests (ISO-8859-1 => windows-1252)"

This reverts commit 9c188b20fbb4d4c2006ab1a611ed8a9b971e7cee.

Broke several browser_tests which depended on the previous behavior:
BrowserEncodingTest.TestOverrideEncoding
EncodingAliases/BrowserEncodingTest.TestEncodingAliasMapping/16
BrowserEncodingTest.TestEncodingAutoDetect
EncodingAliases/BrowserEncodingTest.TestEncodingAliasMapping/3

E.g.
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=BrowserEncodingTest.TestOverrideEncoding&testType=browser_tests

TBR=jshin@chromium.org
BUG=412053
NOTRY=true

Review URL: https://codereview.chromium.org/658193002

git-svn-id: svn://svn.chromium.org/blink/trunk@183822 bbb929c8-8fbe-4397-9dbb-9b2b20218538