[skia] Fix build creating an instance of std::span for the StringView…

… constructor

https://bugs.webkit.org/show_bug.cgi?id=273616

Reviewed by Alejandro G. Castro.

Fixes error: class template placeholder 'std::span' not permitted in this context

The StringView constructor is overloaded and there are several constructors that
could potentially take a std::span. The use of {} may not provide enough information
for the compiler to unambiguously choose a constructor.

The constructor of std::span explicitly makes it easier for the compiler to deduce
the template arguments correctly.

* Source/WebCore/platform/graphics/skia/GlyphPageSkia.cpp:
(WebCore::GlyphPage::fill):

Canonical link: https://commits.webkit.org/278451@main

Source/WebCore/platform/graphics/skia/GlyphPageSkia.cpp

@@ -41,7 +41,7 @@ bool GlyphPage::fill(UChar* buffer, unsigned bufferLength)
     if (!skiaHarfBuzzFont)
         return false;
 
-    StringView stringView(std::span { buffer, bufferLength });
+    StringView stringView(std::span(buffer, bufferLength));
     auto codePoints = stringView.codePoints();
     auto codePointsIterator = codePoints.begin();