Fix mistaken assumptions in tests

content/renderer/browser_plugin/browser_plugin_browsertest.cc

Index: content/renderer/browser_plugin/browser_plugin_browsertest.cc
diff --git a/content/renderer/browser_plugin/browser_plugin_browsertest.cc b/content/renderer/browser_plugin/browser_plugin_browsertest.cc
index 36ee92cf0fa960884f921816aac912aba686e43a..0d2ed7387ad6c2c4884db5fbf5f6558ab9ed4b28 100644
--- a/content/renderer/browser_plugin/browser_plugin_browsertest.cc
+++ b/content/renderer/browser_plugin/browser_plugin_browsertest.cc
@@ -319,11 +319,17 @@ TEST_F(BrowserPluginTest, ResizeFlowControl) {
   browser_plugin_manager()->sink().ClearMessages();
 
   // Resize the browser plugin three times.
+
   ExecuteJavaScript("document.getElementById('browserplugin').width = '641px'");
+  GetMainFrame()->view()->layout();
   ProcessPendingMessages();
+
   ExecuteJavaScript("document.getElementById('browserplugin').width = '642px'");
+  GetMainFrame()->view()->layout();
   ProcessPendingMessages();
+
   ExecuteJavaScript("document.getElementById('browserplugin').width = '643px'");
+  GetMainFrame()->view()->layout();
   ProcessPendingMessages();
 
   // Expect to see one resize messsage in the sink. BrowserPlugin will not issue