Clear cache before running the test

third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js

Index: third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js b/third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js
index 92ccdd6fa936ce7de68cf1bd036eb4796230e336..64078f95386d1b2089a18bb2514949f26f23e6e9 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector/network-test.js
@@ -124,6 +124,14 @@ InspectorTest.makeFetch = function(url, requestInitializer, callback)
     InspectorTest.callFunctionInPageAsync("makeFetch", [url, requestInitializer]).then(callback);
 }
 
+InspectorTest.clearNetworkCache = function(finishedCallback)
+{
+  // This turns cache off and then on, effectively clearning the cache.
+  var networkAgent = InspectorTest.NetworkAgent;
+  networkAgent.setCacheDisabled(true, networkAgent.setCacheDisabled.bind(
+      networkAgent, false, finishedCallback));
+}
+
 InspectorTest.HARPropertyFormatters = {
     bodySize: "formatAsTypeName",
     compression: "formatAsTypeName",