DevTools: set deviceTextAutosizing emulation defaults to 'false'.
DevTools: set deviceTextAutosizing emulation defaults to 'false'.

TBR=dgozma
NOTRY=true

Review URL: https://codereview.chromium.org/347253002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@176683 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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