Create only a single LegacyRenderWidgetHostHWND per WebContentsViewAura.

ui/views/controls/webview/webview_interactive_uitest.cc

Index: ui/views/controls/webview/webview_interactive_uitest.cc
diff --git a/ui/views/controls/webview/webview_interactive_uitest.cc b/ui/views/controls/webview/webview_interactive_uitest.cc
index f1179b83eab2f8d4dfc6fbc50aef6fdda2dad54b..34f72f6b7ee919eb26e60e7aaba4fc74b510aa30 100644
--- a/ui/views/controls/webview/webview_interactive_uitest.cc
+++ b/ui/views/controls/webview/webview_interactive_uitest.cc
@@ -15,6 +15,10 @@
 #include "ui/views/test/webview_test_helper.h"
 #include "ui/views/test/widget_test.h"
 
+#if defined(OS_WIN)
+#include "ui/gfx/win/dpi.h"
+#endif
+
 namespace {
 
 class WebViewInteractiveUiTest : public views::test::WidgetTest {
@@ -25,6 +29,9 @@ class WebViewInteractiveUiTest : public views::test::WidgetTest {
   virtual void SetUp() OVERRIDE {
     gfx::GLSurface::InitializeOneOffForTests();
     WidgetTest::SetUp();
+#if defined(OS_WIN)
+    gfx::InitDeviceScaleFactor(1.0f);
+#endif
   }
 
  protected: