Bug 1492482 - Remove CPOW usage from browser_saveImageURL.js. r=baku

This also "fixes" what appears to be some broken checks by switching
them to todo()'s. I filed bug 1492885 to investigate these busted
checks, and re-enable them.

Depends on D6970

Differential Revision: https://phabricator.services.mozilla.com/D6971

--HG--
extra : moz-landing-system : lando

toolkit/content/tests/browser/browser_saveImageURL.js

@@ -38,15 +38,18 @@ add_task(async function preferred_API() {
 
     saveImageURL(url, "image.jpg", null, true, false, null, null, null, null,
       false, gBrowser.contentPrincipal);
-    let channel = gBrowser.contentWindowAsCPOW.docShell.currentDocumentChannel;
-    if (channel) {
-      ok(true, channel.QueryInterface(Ci.nsIHttpChannelInternal)
-                      .channelIsForDownload);
+    await ContentTask.spawn(gBrowser.selectedBrowser, null, async () => {
+      let channel = docShell.currentDocumentChannel;
+      if (channel) {
+        todo(channel.QueryInterface(Ci.nsIHttpChannelInternal)
+                    .channelIsForDownload);
+
+        // Throttleable is the only class flag assigned to downloads.
+        todo(channel.QueryInterface(Ci.nsIClassOfService).classFlags ==
+             Ci.nsIClassOfService.Throttleable);
+      }
+    });
 
-      // Throttleable is the only class flag assigned to downloads.
-      ok(channel.QueryInterface(Ci.nsIClassOfService).classFlags,
-         Ci.nsIClassOfService.Throttleable);
-    }
     await waitForFilePicker();
   });
 });
@@ -74,15 +77,18 @@ add_task(async function deprecated_API() {
     // pass the XUL document instead to test this interface.
     let doc = document;
 
-    let channel = gBrowser.contentWindowAsCPOW.docShell.currentDocumentChannel;
-    if (channel) {
-      ok(true, channel.QueryInterface(Ci.nsIHttpChannelInternal)
-                      .channelIsForDownload);
 
-      // Throttleable is the only class flag assigned to downloads.
-      ok(channel.QueryInterface(Ci.nsIClassOfService).classFlags,
-         Ci.nsIClassOfService.Throttleable);
-    }
+    await ContentTask.spawn(gBrowser.selectedBrowser, null, async () => {
+      let channel = docShell.currentDocumentChannel;
+      if (channel) {
+        todo(channel.QueryInterface(Ci.nsIHttpChannelInternal)
+                    .channelIsForDownload);
+
+        // Throttleable is the only class flag assigned to downloads.
+        todo(channel.QueryInterface(Ci.nsIClassOfService).classFlags ==
+             Ci.nsIClassOfService.Throttleable);
+      }
+    });
     saveImageURL(url, "image.jpg", null, true, false, null, doc, null, null);
     await waitForFilePicker();
   });