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

Source/platform/text/TextBreakIterator.cpp

Index: Source/platform/text/TextBreakIterator.cpp
diff --git a/Source/platform/text/TextBreakIterator.cpp b/Source/platform/text/TextBreakIterator.cpp
index 98e21342abfcef452a7e745e81df0c57c0d1edc9..648ce8b0a4d1e51f15f8993f42fae425e88f9c3e 100644
--- a/Source/platform/text/TextBreakIterator.cpp
+++ b/Source/platform/text/TextBreakIterator.cpp
@@ -50,30 +50,6 @@
     return num;
 }
 
-ClusterData countCharactersAndGraphemesInCluster(const UChar* normalizedBuffer, unsigned normalizedBufferLength, uint16_t startIndex, uint16_t endIndex)
-{
-    if (startIndex > endIndex) {
-        uint16_t tempIndex = startIndex;
-        startIndex = endIndex;
-        endIndex = tempIndex;
-    }
-
-    uint16_t length = endIndex - startIndex;
-    ASSERT(static_cast<unsigned>(startIndex + length) <= normalizedBufferLength);
-    TextBreakIterator* cursorPosIterator = cursorMovementIterator(&normalizedBuffer[startIndex], normalizedBufferLength);
-
-    int cursorPos = cursorPosIterator->current();
-    unsigned numGraphemes = 0;
-    while (cursorPos < length) {
-        cursorPos = cursorPosIterator->next();
-        if (cursorPos == TextBreakDone)
-            return ClusterData(numGraphemes, normalizedBufferLength);
-
-        numGraphemes++;
-    }
-
-    return ClusterData(numGraphemes, cursorPos);
-}
 
 static inline bool isBreakableSpace(UChar ch)
 {