[Webkit-unassigned] [Bug 123974] New: Remove Japanese encoding detector

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123974

           Summary: Remove Japanese encoding detector
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: ap at webkit.org, enrica at apple.com, jonlee at apple.com,
                    mmaxfield at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/3b87a35b8ccb719156c4af78968915de96e23517

1. Remove Japanese encoding detector. Often, it misdetects. More importantly, it's not used at all (it's a dead code unless the default encoding is Japanese [1]). 
2. Try to sniff meta tag for charset before auto-detecting.

[1] That's because 'shouldAutoDetect' and isJapaneseEncoding() cannot be satisfied at the same time except when the default encoding is Japanese (e.g. Shift_JIS). 

The only downside is that we'll misdecode a page in ISO-2022-JP without any charset declaration (http C-T header, html meta, xml head, css , etc) even when the default encoding is Japanese. However, the percentage of ISO-2022-JP pages without charset declaration is miniscule and it's not worth having this code.

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