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

third_party/WebKit/public/platform/WebTraceLocation.h

Index: third_party/WebKit/public/platform/WebTraceLocation.h
diff --git a/third_party/WebKit/public/platform/WebTraceLocation.h b/third_party/WebKit/public/platform/WebTraceLocation.h
index 168badc5bffa73f694b60ed30dc792a7ba8f31e1..3203f0805ae85ceb1534ec0937db30927a3605c4 100644
--- a/third_party/WebKit/public/platform/WebTraceLocation.h
+++ b/third_party/WebKit/public/platform/WebTraceLocation.h
@@ -5,12 +5,27 @@
 #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__)
 
 }