Revert of Elements whose contents start with an astral Unicode symbol disappear when CSS `::first-letter` is …

Source/platform/text/TextBreakIterator.h

Index: Source/platform/text/TextBreakIterator.h
diff --git a/Source/platform/text/TextBreakIterator.h b/Source/platform/text/TextBreakIterator.h
index b595ab5da98030f0c0af295d3bd272044eae37af..72187c6c3cc7f1c2deba1dfcfb85bbf31b531645 100644
--- a/Source/platform/text/TextBreakIterator.h
+++ b/Source/platform/text/TextBreakIterator.h
@@ -29,15 +29,6 @@
 #include <unicode/brkiter.h>
 
 namespace blink {
-
-struct ClusterData {
-    ClusterData(unsigned numGraphemes, unsigned numCharacters)
-        : graphemes(numGraphemes)
-        , characters(numCharacters)
-    { }
-    unsigned graphemes;
-    unsigned characters;
-};
 
 typedef icu::BreakIterator TextBreakIterator;
 
@@ -264,8 +255,6 @@
 // of a non-combining character and following combining characters is
 // counted as 1 grapheme cluster.
 PLATFORM_EXPORT unsigned numGraphemeClusters(const String&);
-// Counts the number of graphemes and characters.
-PLATFORM_EXPORT ClusterData countCharactersAndGraphemesInCluster(const UChar* normalizedBuffer, unsigned normalizedBufferLength, uint16_t startIndex, uint16_t endIndex);
 
 }