Fix "unreachable code" warnings (MSVC warning 4702) in chrome/browser/.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
===================================================================
--- chrome/browser/ui/views/frame/browser_view.cc	(revision 256983)
+++ chrome/browser/ui/views/frame/browser_view.cc	(working copy)
@@ -958,7 +958,8 @@
 bool BrowserView::ShouldHideUIForFullscreen() const {
 #if defined(USE_ASH)
   // Immersive mode needs UI for the slide-down top panel.
-  return IsFullscreen() && !immersive_mode_controller_->IsEnabled();
+  if (immersive_mode_controller_->IsEnabled())
+    return false;
 #endif
   return IsFullscreen();
 }