Fix testharness result parsing, make "Harness error" count as failure.

third_party/WebKit/LayoutTests/http/tests/origin_trials/sample-api-script-added-expected.txt

+This is a testharness.js-based test.
+Harness Error. harness_status.status = 1 , harness_status.message = 1 duplicate test name: "Attribute should exist and return value"
+PASS Accessing attribute should throw error 
+PASS Attribute should exist and return value, with trial disabled 
+PASS Attribute should not exist, with trial disabled 
+PASS Constant should not exist, with trial disabled 
+PASS Attribute should not exist on partial interface, with trial disabled 
+PASS Static attribute should not exist on partial interface, with trial disabled 
+PASS Constant should not exist on partial interface, with trial disabled 
+PASS Method should not exist on partial interface, with trial disabled 
+PASS Static method should not exist on partial interface, with trial disabled 
+PASS Attribute should exist and return value 
+PASS Attribute should exist and return value 
+PASS Constant should exist on interface and return value 
+PASS Constant should exist on interface and not be modifiable 
+PASS Attribute should exist on partial interface and return value 
+PASS Static attribute should exist on partial interface and return value 
+PASS Constant should exist on partial interface and return value 
+PASS Method should exist on partial interface and return value 
+PASS Static method should exist on partial interface and return value 
+PASS Attribute should exist on interface and return value 
+PASS Static attribute should exist on interface and return value 
+PASS Attribute should exist and not throw exception in worker 
+PASS Attribute should exist and return value in worker 
+PASS Constant should exist and return value in worker 
+PASS Constant should exist and not be modifiable in worker 
+Harness: the test ran to completion.
+