Text selection is not greyed out when the window looses focus

[Olivier Tilloy]

While working on exposing the text selection colors to embedders, I realized that the inactive selection colors never seem to be used. It appears WebViewImpl::setIsActive() is never called with false, which is what is required to grey out the current selection.

RenderWidgetHostImpl::SetActive() needs to be called with false when the window looses focus.
Currently, whenever the window containing the webview receives and looses focus, RenderWidgetHostView::Focus() is called in both cases.