Revert of Remove EventSender from ImageLoader

third_party/WebKit/LayoutTests/http/tests/resources/srcset-helper.js

Index: third_party/WebKit/LayoutTests/http/tests/resources/srcset-helper.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/resources/srcset-helper.js b/third_party/WebKit/LayoutTests/http/tests/resources/srcset-helper.js
index 3e5bc9fb9ee86362540a099f60164cdba59249dc..90b869a404b3f219a2b3e349f5f8476888a1555e 100644
--- a/third_party/WebKit/LayoutTests/http/tests/resources/srcset-helper.js
+++ b/third_party/WebKit/LayoutTests/http/tests/resources/srcset-helper.js
@@ -21,17 +21,11 @@
     } else {
         // Right now there is a bug that srcset does not properly deal with dynamic changes to the scale factor,
         // so to work around that, we must reload the page to get the new image.
-        //
-        // At the time of the Document load event, there might be other
-        // ongoing tasks that can cause new images to be loaded. To evict
-        // those images, we delay evictAllResources() call a little.
-        setTimeout(function() {
-          sessionStorage.pageReloaded = true;
-          if (window.internals) {
-              internals.evictAllResources();
-          }
-          document.location.reload(true);
-        }, 300);
+        sessionStorage.pageReloaded = true;
+        if (window.internals) {
+            internals.evictAllResources();
+        }
+        document.location.reload(true);
     }
 }