Store SourceLocation in ErrorEvent.

third_party/WebKit/Source/bindings/core/v8/SourceLocation.h

Index: third_party/WebKit/Source/bindings/core/v8/SourceLocation.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/SourceLocation.h b/third_party/WebKit/Source/bindings/core/v8/SourceLocation.h
index 93c918f2b5a9077643f32993f4f661f63bea4bcc..74cd28273101fc225ffce3a551613ee831454063 100644
--- a/third_party/WebKit/Source/bindings/core/v8/SourceLocation.h
+++ b/third_party/WebKit/Source/bindings/core/v8/SourceLocation.h
@@ -28,11 +28,10 @@ public:
     static PassOwnPtr<SourceLocation> fromMessage(v8::Isolate*, v8::Local<v8::Message>, ExecutionContext*);
 
     static PassOwnPtr<SourceLocation> create(const String& url, unsigned lineNumber, unsigned columnNumber, std::unique_ptr<V8StackTrace>, int scriptId = 0);
-    static PassOwnPtr<SourceLocation> createFromNonEmptyV8StackTrace(std::unique_ptr<V8StackTrace>, int scriptId = 0);
     ~SourceLocation();
 
     bool isEmpty() const { return m_url.isNull(); }
-    String url() const { return m_url; }
+    const String& url() const { return m_url; }
     unsigned lineNumber() const { return m_lineNumber; }
     unsigned columnNumber() const { return m_columnNumber; }
     std::unique_ptr<V8StackTrace> takeStackTrace() { return std::move(m_stackTrace); }
@@ -42,6 +41,7 @@ public:
 
 private:
     SourceLocation(const String& url, unsigned lineNumber, unsigned columnNumber, std::unique_ptr<V8StackTrace>, int scriptId);
+    static PassOwnPtr<SourceLocation> createFromNonEmptyV8StackTrace(std::unique_ptr<V8StackTrace>, int scriptId);
 
     String m_url;
     unsigned m_lineNumber;