content: Rename DumpRenderTree references to test_runner.

content/test/test_blink_web_unit_test_support.cc

Index: content/test/test_blink_web_unit_test_support.cc
diff --git a/content/test/test_blink_web_unit_test_support.cc b/content/test/test_blink_web_unit_test_support.cc
index 525b25f20322083d95ca0f538f6b851e4822cb2b..0be226abad178019bba86840f98199c806b9196e 100644
--- a/content/test/test_blink_web_unit_test_support.cc
+++ b/content/test/test_blink_web_unit_test_support.cc
@@ -181,7 +181,7 @@ blink::WebURLLoader* TestBlinkWebUnitTestSupport::createURLLoader() {
 }
 
 blink::WebString TestBlinkWebUnitTestSupport::userAgent() {
-  return blink::WebString::fromUTF8("DumpRenderTree/0.0.0.0");
+  return blink::WebString::fromUTF8("test_runner/0.0.0.0");
 }
 
 blink::WebData TestBlinkWebUnitTestSupport::loadResource(const char* name) {