Make static KURLs thread safe

third_party/WebKit/Source/platform/weborigin/KURL.h

Index: third_party/WebKit/Source/platform/weborigin/KURL.h
diff --git a/third_party/WebKit/Source/platform/weborigin/KURL.h b/third_party/WebKit/Source/platform/weborigin/KURL.h
index d0e3092f0b10cf860afc044a5a04c1ed7df9a7d4..57b6432a34901af21c036faa3e60fbd51870f7ef 100644
--- a/third_party/WebKit/Source/platform/weborigin/KURL.h
+++ b/third_party/WebKit/Source/platform/weborigin/KURL.h
@@ -42,6 +42,8 @@ class TextEncoding;
 
 namespace blink {
 
+PLATFORM_EXPORT extern const char kAboutBlankUrl[];
+
 struct KURLHash;
 
 enum ParsedURLStringTag { ParsedURLString };
@@ -232,7 +234,6 @@ PLATFORM_EXPORT bool operator!=(const String&, const KURL&);
 PLATFORM_EXPORT bool equalIgnoringFragmentIdentifier(const KURL&, const KURL&);
 
 PLATFORM_EXPORT const KURL& blankURL();
-PLATFORM_EXPORT const KURL& srcdocURL();
 
 // Functions to do URL operations on strings.
 // These are operations that aren't faster on a parsed URL.