Clean up TCW, make it solely a hub for 1:1 observer/helper objects.

chrome/browser/ui/webui/print_preview_handler_unittest.cc

Index: chrome/browser/ui/webui/print_preview_handler_unittest.cc
diff --git a/chrome/browser/ui/webui/print_preview_handler_unittest.cc b/chrome/browser/ui/webui/print_preview_handler_unittest.cc
index 1b27188b74cca733c7a568419f452120f1728d50..e21cff6bae33c7e3488e6e85bd769eeb5d441a33 100644
--- a/chrome/browser/ui/webui/print_preview_handler_unittest.cc
+++ b/chrome/browser/ui/webui/print_preview_handler_unittest.cc
@@ -15,6 +15,7 @@
 #include "chrome/browser/ui/webui/print_preview_ui.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
+#include "content/browser/tab_contents/tab_contents.h"
 #include "printing/page_size_margins.h"
 #include "printing/print_job_constants.h"
 
@@ -68,7 +69,8 @@ class PrintPreviewHandlerTest : public BrowserWithTestWindowTest {
     preview_tab_ = controller->GetOrCreatePreviewTab(initiator_tab);
     ASSERT_TRUE(preview_tab_);
 
-    preview_ui_ = static_cast<PrintPreviewUI*>(preview_tab_->web_ui());
+    preview_ui_ =
+        static_cast<PrintPreviewUI*>(preview_tab_->tab_contents()->web_ui());
     ASSERT_TRUE(preview_ui_);
   }