net: Ignore the magic number sniffer if it determines an application/octet-st...

net/base/mime_sniffer_unittest.cc

Index: net/base/mime_sniffer_unittest.cc
===================================================================
--- net/base/mime_sniffer_unittest.cc	(revision 33698)
+++ net/base/mime_sniffer_unittest.cc	(working copy)
@@ -88,6 +88,14 @@
   };
 
   TestArray(tests, arraysize(tests));
+
+  // Don't sniff Linux installers with embedded shell scripts as text/plain.
+  std::string content = "#!/bin/bash\necho hi\n";
+  content.resize(5000, '\n');
+  content.resize(20000, '\xFD');
+  EXPECT_EQ("application/octet-stream",
+            SniffMimeType(content, "http://www.example.com/foo.bin",
+                          "application/octet-stream"));
 }
 
 TEST(MimeSnifferTest, ChromeExtensionsTest) {