RenderWidget: hoist synchronous IPC out of Init methods.

content/renderer/render_widget_unittest.cc

Index: content/renderer/render_widget_unittest.cc
diff --git a/content/renderer/render_widget_unittest.cc b/content/renderer/render_widget_unittest.cc
index 007e0b5c9a65caded726f89b323d13ae23d9f622..33f9b00c6b46926caeee023ee5ded38d304806f6 100644
--- a/content/renderer/render_widget_unittest.cc
+++ b/content/renderer/render_widget_unittest.cc
@@ -61,8 +61,7 @@ class InteractiveRenderWidget : public RenderWidget {
                      false),
         always_overscroll_(false) {
     webwidget_internal_ = &mock_webwidget_;
-    // A RenderWidget is not fully initialized until it has a routing ID.
-    SetRoutingID(++next_routing_id_);
+    InitRoutingID(++next_routing_id_);
   }
 
   void SetTouchRegion(const std::vector<gfx::Rect>& rects) {
@@ -379,8 +378,7 @@ class PopupRenderWidget : public RenderWidget {
                      false,
                      false) {
     webwidget_internal_ = &mock_webwidget_;
-    // A RenderWidget is not fully initialized until it has a routing ID.
-    SetRoutingID(1);
+    InitRoutingID(1);
     did_show_ = true;
   }