[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..8216da5d0c1d62c1bd3021a451f717e9a01ae0fa 100644
--- a/chrome/browser/android/vr_shell/textures/ui_texture.cc
+++ b/chrome/browser/android/vr_shell/textures/ui_texture.cc
@@ -193,11 +193,13 @@ bool UiTexture::GetFontList(int size,
     bool found_name = GetFallbackFontNameForChar(default_font, c, "", &name);
     if (!found_name)
       return false;
-    if (name.empty())
+    if (!name.empty())
       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;
 }