[SafeBrowsing] Block dangerous unchecked downloads based on a Finch trial.

chrome/browser/file_select_helper_unittest.cc

Index: chrome/browser/file_select_helper_unittest.cc
diff --git a/chrome/browser/file_select_helper_unittest.cc b/chrome/browser/file_select_helper_unittest.cc
index c7c128e3b4ac392060d07aba87ae0454acb3a88d..823ccc0843fbe68f77622b28b52193552a93a227 100644
--- a/chrome/browser/file_select_helper_unittest.cc
+++ b/chrome/browser/file_select_helper_unittest.cc
@@ -78,3 +78,35 @@ TEST_F(FileSelectHelperTest, ZipPackage) {
   }
 }
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
+TEST_F(FileSelectHelperTest, GetSanitizedFileName) {
+  // The empty path should be preserved.
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("")),
+            FileSelectHelper::GetSanitizedFileName(base::FilePath()));
+
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("ascii.txt")),
+            FileSelectHelper::GetSanitizedFileName(
+                base::FilePath(FILE_PATH_LITERAL("ascii.txt"))));
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("trailing-spaces-")),
+            FileSelectHelper::GetSanitizedFileName(
+                base::FilePath(FILE_PATH_LITERAL("trailing-spaces "))));
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("path-components-in-name")),
+            FileSelectHelper::GetSanitizedFileName(
+                base::FilePath(FILE_PATH_LITERAL("path/components/in/name"))));
+
+#if defined(OS_WIN)
+  // Invalid UTF-16. However, note that on Windows, the invalid UTF-16 will pass
+  // through without error.
+  base::FilePath::CharType kBadName[] = {0xd801, 0xdc37, 0xdc17, 0};
+#else
+  // Invalid UTF-8
+  base::FilePath::CharType kBadName[] = {0xe3, 0x81, 0x81, 0x81, 0x82, 0};
+#endif
+  base::FilePath bad_filename(kBadName);
+  ASSERT_FALSE(bad_filename.empty());
+  // The only thing we are testing is that if the source filename was non-empty,
+  // the resulting filename is also not empty. Invalid encoded filenames can
+  // cause conversions to fail. Such failures shouldn't cause the resulting
+  // filename to disappear.
+  EXPECT_FALSE(FileSelectHelper::GetSanitizedFileName(bad_filename).empty());
+}