Move identically named TestTabModel classes to anonymous namespace.

chrome/browser/ui/android/tab_model/tab_model_unittest.cc

Index: chrome/browser/ui/android/tab_model/tab_model_unittest.cc
diff --git a/chrome/browser/ui/android/tab_model/tab_model_unittest.cc b/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
index 83295912f5c96bd3f982fc3a15a5e346fc355b65..a42a1219a60e690713908657a9c9e565ec542746 100644
--- a/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
+++ b/chrome/browser/ui/android/tab_model/tab_model_unittest.cc
@@ -25,7 +25,6 @@ class TabModelAndroidProfileMock : public TestingProfile {
   MOCK_METHOD0(GetOffTheRecordProfile, Profile*());
   MOCK_METHOD0(HasOffTheRecordProfile, bool());
 };
-}  // namespace
 
 class TestTabModel : public TabModel {
  public:
@@ -47,6 +46,7 @@ class TestTabModel : public TabModel {
   void SetActiveIndex(int index) override {}
   void CloseTabAt(int index) override {}
 };
+}  // namespace
 
 TEST_F(TabModelTest, TestProfileHandling) {
   // Construct TabModel with standard Profile.