Make chromeos CUPS printing code namespaces consistent.

chrome/browser/chromeos/printing/specifics_translation_unittest.cc

Index: chrome/browser/chromeos/printing/specifics_translation_unittest.cc
diff --git a/chrome/browser/chromeos/printing/specifics_translation_unittest.cc b/chrome/browser/chromeos/printing/specifics_translation_unittest.cc
index 94a6beaecaf8fe98463ab0a5f09e9dbe642b5e46..e32ca77162ba5ba4110fe7b34e9ac552649d864d 100644
--- a/chrome/browser/chromeos/printing/specifics_translation_unittest.cc
+++ b/chrome/browser/chromeos/printing/specifics_translation_unittest.cc
@@ -30,7 +30,6 @@ constexpr char kEffectiveMakeAndModel[] = "Manufacturer Model T1000";
 }  // namespace
 
 namespace chromeos {
-namespace printing {
 
 TEST(SpecificsTranslationTest, SpecificsToPrinter) {
   sync_pb::PrinterSpecifics specifics;
@@ -223,5 +222,4 @@ TEST(SpecificsTranslationTest, MakeAndModelPreferred) {
   EXPECT_EQ(kMakeAndModel, printer->make_and_model());
 }
 
-}  // namespace printing
 }  // namespace chromeos