Mac: remove some now-dead code and add a comment.

chrome/browser/importer/safari_importer_unittest.mm

Index: chrome/browser/importer/safari_importer_unittest.mm
diff --git a/chrome/browser/importer/safari_importer_unittest.mm b/chrome/browser/importer/safari_importer_unittest.mm
index f9ea7384ac5aedc9d6e50e3b01fda77a4639b96e..cc5e18942a2c97fbf1c8710609b2f8abbdb8548f 100644
--- a/chrome/browser/importer/safari_importer_unittest.mm
+++ b/chrome/browser/importer/safari_importer_unittest.mm
@@ -107,7 +107,6 @@ TEST_F(SafariImporterTest, BookmarkImport) {
       EXPECT_EQ(entry.title, kImportedBookmarksData[i].title);
     }
   }
-
 }
 
 TEST_F(SafariImporterTest, FavIconImport) {
@@ -148,25 +147,15 @@ TEST_F(SafariImporterTest, FavIconImport) {
 TEST_F(SafariImporterTest, CanImport) {
   uint16 items = NONE;
   EXPECT_TRUE(SafariImporter::CanImport(GetTestSafariLibraryPath(), &items));
-  // We can't check the exact value of items because the HOME_PAGE bit depends
-  // on the defaults of the current machine.
-  EXPECT_EQ(items & HISTORY, HISTORY);
-  EXPECT_EQ(items & FAVORITES, FAVORITES);
+  EXPECT_EQ(items, HISTORY | FAVORITES);
   EXPECT_EQ(items & COOKIES, NONE);
   EXPECT_EQ(items & PASSWORDS, NONE);
   EXPECT_EQ(items & SEARCH_ENGINES, NONE);
+  EXPECT_EQ(items & HOME_PAGE, NONE);
 
   // Check that we don't import anything from a bogus library directory.
   FilePath fake_library_dir;
   file_util::CreateNewTempDirectory("FakeSafariLibrary", &fake_library_dir);
   FileAutoDeleter deleter(fake_library_dir);
-
-  // Despite the fact that we're pointing to an empty library directory,
-  // CanImport may still return true on systems where the Safari defaults
-  // are defined. This means that we can't make assumptions about the return
-  // value here.
-  SafariImporter::CanImport(fake_library_dir, &items);
-  EXPECT_EQ(items & ~HOME_PAGE, NONE); // See comment above about HOME_PAGE.
-
-
+  EXPECT_FALSE(SafariImporter::CanImport(fake_library_dir, &items));
 }