Primary FontData of FontFallbackList should have space character

Source/platform/fonts/SegmentedFontData.h

Index: Source/platform/fonts/SegmentedFontData.h
diff --git a/Source/platform/fonts/SegmentedFontData.h b/Source/platform/fonts/SegmentedFontData.h
index 31a2166132c723a3d63e5442317607b59f7ee476..600d845c9ef6d47a5449055e56d288e2ce336c76 100644
--- a/Source/platform/fonts/SegmentedFontData.h
+++ b/Source/platform/fonts/SegmentedFontData.h
@@ -62,6 +62,7 @@ public:
     void appendRange(const FontDataRange& range) { m_ranges.append(range); }
     unsigned numRanges() const { return m_ranges.size(); }
     const FontDataRange& rangeAt(unsigned i) const { return m_ranges[i]; }
+    bool containsCharacter(UChar32) const;
 
 #ifndef NDEBUG
     virtual String description() const OVERRIDE;
@@ -78,8 +79,6 @@ private:
     virtual bool isLoadingFallback() const OVERRIDE;
     virtual bool isSegmented() const OVERRIDE;
 
-    bool containsCharacter(UChar32) const;
-
     Vector<FontDataRange, 1> m_ranges;
 };