Make sure getFallbackFamily() always sets *scriptChecked.

This avoids an uninitialized read in
FontCache::fallbackFontForCharacter(), which assumes the script is set.
Found by DrMemory in
http://build.chromium.org/p/chromium.memory.fyi/builders/Windows%20Content%20Browser%20%28DrMemory%20full%29%20%284%29/builds/5885/steps/memory%20test%3A%20content_browsertests/logs/stdio.

Review URL: https://codereview.chromium.org/1327143002

git-svn-id: svn://svn.chromium.org/blink/trunk@202009 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/platform/fonts/win/FontFallbackWin.cpp

@@ -404,8 +404,11 @@ const UChar* getFallbackFamily(UChar32 character,
     ASSERT(character);
     ASSERT(fontManager);
     const UChar* family = getFontBasedOnUnicodeBlock(character, fontManager);
-    if (family)
+    if (family) {
+        if (scriptChecked)
+            *scriptChecked = USCRIPT_INVALID_CODE;
         return family;
+    }
 
     UScriptCode script = getScript(character);