[Webkit-unassigned] [Bug 225878] New: Replace non-ownership transfer requiring uses of WTF::Function to use WTF::ScopeLambda to avoid allocation of WTF::Function

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225878

            Bug ID: 225878
           Summary: Replace non-ownership transfer requiring uses of
                    WTF::Function to use WTF::ScopeLambda to avoid
                    allocation of WTF::Function
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sam at webkit.org

Using WTF::Function (or std::function) in cases where are using a functor as an abstraction to allow scope customization, iteration or predicate functions is wasteful. We should instead be using the non-allocating WTF::ScopedLambda. 

Some examples in WebCore are:
- the traverseSubresources() functions on various classes.
- readURLsFromPasteboardAsString() in DataTransfer.cpp
- Document::forEachMediaElement()
- etc.

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