Do not use the utility process on linux....

chrome/browser/utility_process_host_unittest.cc

Index: chrome/browser/utility_process_host_unittest.cc
===================================================================
--- chrome/browser/utility_process_host_unittest.cc	(revision 27895)
+++ chrome/browser/utility_process_host_unittest.cc	(working copy)
@@ -124,6 +124,9 @@
   bool observed_;
 };
 
+#if !defined(OS_POSIX)
+// We should not run this on linux (crbug.com/22703) or MacOS (crbug.com/8102)
+// until problems related to autoupdate are fixed.
 TEST_F(UtilityProcessHostTest, ExtensionUnpacker) {
   // Copy the test extension into a temp dir and install from the temp dir.
   FilePath extension_file;
@@ -152,5 +155,6 @@
   // Clean up the temp dir.
   file_util::Delete(temp_extension_dir, true);
 }
+#endif
 
 }  // namespace