Revert of Use removeFontFace to avoid resetting fontSelector.

Source/platform/fonts/GenericFontFamilySettings.cpp

Index: Source/platform/fonts/GenericFontFamilySettings.cpp
diff --git a/Source/platform/fonts/GenericFontFamilySettings.cpp b/Source/platform/fonts/GenericFontFamilySettings.cpp
index 27916d24ed64c75f00f9468a80ad51149e4348fe..7f436745e7a587254f99165157a888c6bfbddc04 100644
--- a/Source/platform/fonts/GenericFontFamilySettings.cpp
+++ b/Source/platform/fonts/GenericFontFamilySettings.cpp
@@ -42,18 +42,6 @@
     , m_fantasyFontFamilyMap(other.m_fantasyFontFamilyMap)
     , m_pictographFontFamilyMap(other.m_pictographFontFamilyMap)
 {
-}
-
-GenericFontFamilySettings& GenericFontFamilySettings::operator=(const GenericFontFamilySettings& other)
-{
-    m_standardFontFamilyMap = other.m_standardFontFamilyMap;
-    m_serifFontFamilyMap = other.m_serifFontFamilyMap;
-    m_fixedFontFamilyMap = other.m_fixedFontFamilyMap;
-    m_sansSerifFontFamilyMap = other.m_sansSerifFontFamilyMap;
-    m_cursiveFontFamilyMap = other.m_cursiveFontFamilyMap;
-    m_fantasyFontFamilyMap = other.m_fantasyFontFamilyMap;
-    m_pictographFontFamilyMap = other.m_pictographFontFamilyMap;
-    return *this;
 }
 
 // Sets the entry in the font map for the given script. If family is the empty string, removes the entry instead.