[vr] Fix incorrect negation in font fallback logic.

chrome/browser/android/vr_shell/textures/ui_texture.cc

Index: chrome/browser/android/vr_shell/textures/ui_texture.cc
diff --git a/chrome/browser/android/vr_shell/textures/ui_texture.cc b/chrome/browser/android/vr_shell/textures/ui_texture.cc
index ef2630dbb34568416757eba26f6961b21d3647ed..f7885910e5e6cda478464a7acd75ef5b4aadbd09 100644
--- a/chrome/browser/android/vr_shell/textures/ui_texture.cc
+++ b/chrome/browser/android/vr_shell/textures/ui_texture.cc
@@ -196,8 +196,10 @@ bool UiTexture::GetFontList(int size,
     if (name.empty())

[mthiesse, 2017/06/08 01:13:18]

Did you forget the main fix? ;)

       names.insert(name);
   }
-  for (const auto& name : names)
+  for (const auto& name : names) {
+    DCHECK(!name.empty());
     fonts.push_back(gfx::Font(name, size));
+  }
   *font_list = gfx::FontList(fonts);
   return true;
 }