[Webkit-unassigned] [Bug 190838] New: Cleanup: MIMETypeRegistry functions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190838

            Bug ID: 190838
           Summary: Cleanup: MIMETypeRegistry functions
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com

Some of the functions in MIMETypeRegistry return HashSet<Sting>. For these functions, we need to do the following:

1. Use NeverDestroyed<> instead of allocating raw pointers with the new operator.
2. Use std::initializer_list to initialize the static HashSet<String> when the list of supported mime types is static list of strings.
3. Use makeNeverDestroyed() to initialize the static HashSet<String> when the list of supported mime types is retrieved from a system call.
3. Replace the functions MIMETypeRegistry::getSupported...() with MIMETypeRegistry::supported...(). The functions whose names are MIMETypeRegistry::supported...() will be responsible of filling and validating their local NeverDestroyed<> and returning the underlaying HashSets.
4. As a preparation for landing 190454, the term UTI will be replaced by ImageSourceType. A new SPI will be added and adding UTI in its name does not seem  appealing.

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