Refactor download image-MIME-type-detection code.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index 3eed80f648c6519db9819ac8b8770ccd0e0678b4..507b2c19a5f56200c5a835c1a125ba30f6bd2bb1 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -363,6 +363,10 @@ const char kMemoryPressureThresholds[] = "memory-pressure-thresholds";
 // Enables natural scroll by default.
 const char kNaturalScrollDefault[] = "enable-natural-scroll-default";
 
+// An optional comma-separated list of IDs of apps that can be used to take
+// notes. If unset, a hardcoded list is used instead.
+const char kNoteTakingAppIds[] = "note-taking-app-ids";
+
 // Indicates that if we should start bootstrapping Master OOBE.
 const char kOobeBootstrappingMaster[] = "oobe-bootstrapping-master";