bug 555435 - compact the cmap block arrays after loading to reduce memory footprint. r=jdaggett

gfx/thebes/src/gfxFontUtils.cpp

@@ -277,6 +277,8 @@ gfxFontUtils::ReadCMAPTableFormat12(PRUint8 *aBuf, PRUint32 aLength, gfxSparseBi
         prevEndCharCode = endCharCode;
     }
 
+    aCharacterMap.mBlocks.Compact();
+
     return NS_OK;
 }
 
@@ -352,6 +354,8 @@ gfxFontUtils::ReadCMAPTableFormat4(PRUint8 *aBuf, PRUint32 aLength, gfxSparseBit
         }
     }
 
+    aCharacterMap.mBlocks.Compact();
+
     return NS_OK;
 }