views: Make view::Views::GetPreferredSize() const.

chrome/test/base/view_event_test_base.cc

Index: chrome/test/base/view_event_test_base.cc
diff --git a/chrome/test/base/view_event_test_base.cc b/chrome/test/base/view_event_test_base.cc
index 2d64c5d408c07be184b86a8d40b21c808205ad9a..39293ab0567c69fd3b1274581c910523c81a97c1 100644
--- a/chrome/test/base/view_event_test_base.cc
+++ b/chrome/test/base/view_event_test_base.cc
@@ -54,7 +54,7 @@ class TestView : public views::View {
     PreferredSizeChanged();
   }
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     if (!preferred_size_.IsEmpty())
       return preferred_size_;
     return View::GetPreferredSize();
@@ -228,7 +228,7 @@ void ViewEventTestBase::StartMessageLoopAndRunTest() {
   content::RunMessageLoop();
 }
 
-gfx::Size ViewEventTestBase::GetPreferredSize() {
+gfx::Size ViewEventTestBase::GetPreferredSize() const {
   return gfx::Size();
 }