Revert 150279 "Do not update a generated file if the contents is..."
Revert 150279 "Do not update a generated file if the contents is..."

> Do not update a generated file if the contents is the same
> 
> After this CL, changes in CodeGeneratorV8.pm that don't change generated code
> won't cause rebuild of V8XXX.{h,cpp}.
> 
> R=abarth,thakis
> 
> Review URL: https://chromiumcodereview.appspot.com/14970006

TBR=haraken@chromium.org

Review URL: https://codereview.chromium.org/14785016

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@150283 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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