POSIX: re-enable strict aliasing

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 8c52017ed595676ad3ff5f65a205e1aa2324dc7f..b7f97bfe88924134734fc60a105721726915281e 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -2107,13 +2107,13 @@ void RenderWidgetHostViewAura::SetCompositionText(
 
   // TODO(suzhe): convert both renderer_host and renderer to use
   // ui::CompositionText.
-  const std::vector<WebKit::WebCompositionUnderline>& underlines =
-      reinterpret_cast<const std::vector<WebKit::WebCompositionUnderline>&>(
-          composition.underlines);
+  const std::vector<WebKit::WebCompositionUnderline>* underlines =
+      bit_cast<const std::vector<WebKit::WebCompositionUnderline>*>(
+          &composition.underlines);
 
   // TODO(suzhe): due to a bug of webkit, we can't use selection range with
   // composition string. See: https://bugs.webkit.org/show_bug.cgi?id=37788
-  host_->ImeSetComposition(composition.text, underlines,
+  host_->ImeSetComposition(composition.text, *underlines,
                            composition.selection.end(),
                            composition.selection.end());