Disable ResourceBundleImageTest.FallbackToNone on iOS.

ui/base/resource/resource_bundle_unittest.cc

Index: ui/base/resource/resource_bundle_unittest.cc
diff --git a/ui/base/resource/resource_bundle_unittest.cc b/ui/base/resource/resource_bundle_unittest.cc
index 4213507dc523478c5a152d0f54eed9111ecc16bd..945a596e41fff41df98a9476491a8244de47dd20 100644
--- a/ui/base/resource/resource_bundle_unittest.cc
+++ b/ui/base/resource/resource_bundle_unittest.cc
@@ -562,7 +562,13 @@ TEST_F(ResourceBundleImageTest, GetImageNamedFallback1xRounding) {
 }
 #endif
 
-TEST_F(ResourceBundleImageTest, FallbackToNone) {
+#if defined(OS_IOS)
+// Fails on devices that have non-100P scaling. See crbug.com/298406
+#define MAYBE_FallbackToNone DISABLED_FallbackToNone
+#else
+#define MAYBE_FallbackToNone FallbackToNone
+#endif
+TEST_F(ResourceBundleImageTest, MAYBE_FallbackToNone) {
   base::FilePath data_default_path = dir_path().AppendASCII("sample.pak");
 
   // Create the pak files.