Geolocation: rename Geoposition to Position to follow Spec

third_party/WebKit/Source/modules/geolocation/PositionCallback.idl

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+// https://www.w3.org/TR/geolocation-API/#position-callback
+
+// TODO(mcasas, foolip): PositionCallback should be a callback function, not an
+// interface, see https://crbug.com/569301

[foolip, 2017/04/11 16:35:37]

s/an interface/a callback interface/

+
 callback interface PositionCallback {
-    void handleEvent(Geoposition position);
+    void handleEvent(Position position);
 };