Remove iOS ifdefs in src/content.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index edddc05eb77d450260ff0c6cbe1c481ec0db139c..a0ce1bea7fee145f2edb33090e38422e888a64c1 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1543,7 +1543,7 @@ void RenderViewImpl::ApplyWebPreferencesInternal(
     blink::WebView* web_view,
     CompositorDependencies* compositor_deps) {
   ApplyWebPreferences(prefs, web_view);
-#if defined(OS_MACOSX) && !defined(OS_IOS)
+#if defined(OS_MACOSX)
   DCHECK(compositor_deps);
   bool is_elastic_overscroll_enabled =
       compositor_deps->IsElasticOverscrollEnabled();
@@ -2123,7 +2123,7 @@ void RenderViewImpl::initializeLayerTreeView() {
     return;
 
   bool use_threaded_event_handling = true;
-#if defined(OS_MACOSX) && !defined(OS_IOS)
+#if defined(OS_MACOSX)
   // Disable threaded event handling if content is not handling the elastic
   // overscroll effect. This includes the cases where the elastic overscroll
   // effect is being handled by Blink (because of command line flags) and older