Add CSSFontSelector::removeFontFaceRule()

Source/core/css/CSSSegmentedFontFace.cpp

Index: Source/core/css/CSSSegmentedFontFace.cpp
diff --git a/Source/core/css/CSSSegmentedFontFace.cpp b/Source/core/css/CSSSegmentedFontFace.cpp
index 09fdefdfd6f807d6d03d4db90348515b45f1cf49..7c0094346ed0a79673ce5839f91248aec5e2b5be 100644
--- a/Source/core/css/CSSSegmentedFontFace.cpp
+++ b/Source/core/css/CSSSegmentedFontFace.cpp
@@ -93,6 +93,16 @@ void CSSSegmentedFontFace::appendFontFace(PassRefPtr<CSSFontFace> fontFace)
     m_fontFaces.append(fontFace);
 }
 
+void CSSSegmentedFontFace::removeFontFace(PassRefPtr<CSSFontFace> fontFace)
+{
+    size_t index = m_fontFaces.find(fontFace);
+    if (index != kNotFound) {
+        pruneTable();
+        m_fontFaces.remove(index);
+        fontFace->clearSegmentedFontFace();
+    }
+}
+
 static void appendFontData(SegmentedFontData* newFontData, PassRefPtr<SimpleFontData> prpFaceFontData, const CSSFontFace::UnicodeRangeSet& ranges)
 {
     RefPtr<SimpleFontData> faceFontData = prpFaceFontData;