[omnibox] Select omnibox text when focusing the omnibox with F6.

Bug: 931541
Change-Id: Ic30aa92c18ebcb4dc09216fef7a09f5e430bf572
Reviewed-on: https://chromium-review.googlesource.com/c/1477807Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633793}

chrome/browser/ui/views/toolbar/toolbar_view.cc

@@ -594,8 +594,8 @@ void ToolbarView::ChildPreferredSizeChanged(views::View* child) {
 // also so that it selects all content in the location bar.
 bool ToolbarView::SetPaneFocusAndFocusDefault() {
   if (!location_bar_->HasFocus()) {
-    location_bar_->FocusLocation();
     SetPaneFocus(location_bar_);
+    location_bar_->FocusLocation();
     return true;
   }