Control.WMSGetFeatureInfo: double setMap on handler

[fredj]

The WMSGetFeatureInfo redefine the setMap function:

  this.handler.setMap(map);
  OpenLayers.Control.prototype.setMap.apply(this, arguments);

But the parent class already call this.handler.setMap(map): the handler.setMap function is called twice.

[fredj]

remove WMSGetFeatureInfo.setMap, not yet tested

[fredj]

tests pass in FF 3.6.6 and Chrome.

The Control/SLDSelect.html tests don't pass but it's not related to this change.

[ahocevar]

Good catch. Please commit if the Control/SLDSelect.html tests also fail without the patch applied.

[fredj]

(In [10437]) remove setMap function from WMSGetFeatureInfo. r=ahocevar (closes #2717)