Revert of Make WebTraceLocation be an alias of tracked_objects::Location

third_party/WebKit/public/platform/WebTraceLocation.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebTraceLocation_h
 #define WebTraceLocation_h
 
-#include "base/location.h"
+#include "WebCommon.h"
 
 namespace blink {
 
-using WebTraceLocation = tracked_objects::Location;
-#define BLINK_FROM_HERE FROM_HERE
+// This class is used to keep track of where posted tasks originate. See base/location.h in Chromium.
+// Currently only store the bits used in Blink, base::Location stores more.
+class BLINK_PLATFORM_EXPORT WebTraceLocation {
+public:
+    // These char*s are not copied and must live for the duration of the program.
+    WebTraceLocation(const char* function, const char* file);
+    WebTraceLocation();
+
+    const char* functionName() const;
+    const char* fileName() const;
+
+private:
+    const char* m_functionName;
+    const char* m_fileName;
+};
+
+#define BLINK_FROM_HERE ::blink::WebTraceLocation(__FUNCTION__, __FILE__)
 
 }
 
 #endif // WebTraceLocation_h