Bug 1667081 - Part 1: Replace usage of nsIFocusManager with nsFocusManager; r=hsivonen

This patch is bascially done by:
perl -p -i -e "s/nsIFocusManager\* /nsFocusManager* /g;" $( find . -name *.cpp )
perl -p -i -e "s/nsCOMPtr<nsIFocusManager>/RefPtr<nsFocusManager>/g;" $( find . -name *.cpp )

Differential Revision: https://phabricator.services.mozilla.com/D91287

dom/html/HTMLInputElement.cpp

@@ -3711,7 +3711,7 @@ nsresult HTMLInputElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
           // for text and password fields when the field was focused by the
           // keyboard or a navigation, the platform allows it, and it wasn't
           // just because we raised a window.
-          nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+          nsFocusManager* fm = nsFocusManager::GetFocusManager();
           if (fm && IsSingleLineTextControl(false) &&
               !aVisitor.mEvent->AsFocusEvent()->mFromRaise &&
               SelectTextFieldOnFocus()) {