Inject orientation closer to wasm for MediaAppIntegrationTest, HandleRawFiles

This better mimics a "real" orientation in a file, so that other layers
between can do their own header machinations.

Bug: 1145029
Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Change-Id: I45e6174d1ef49ac207965680fbbaa48155d91a0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581631Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836000}

chrome/browser/chromeos/web_applications/media_app_integration_browsertest.cc

@@ -234,10 +234,10 @@ IN_PROC_BROWSER_TEST_P(MediaAppIntegrationTest, HandleRawFiles) {
   // includes an Exif rotation.
   constexpr char kAdd270DegreeRotation[] = R"(
     (function() {
-      const realPiexLoad = PiexLoader.load;
-      PiexLoader.load = async (buffer, onFailure) => {
-        const response = await realPiexLoad(buffer, onPiexModuleFailed);
-        response.orientation = 8;
+      const realPiexImage = PiexModule.image;
+      PiexModule.image = (memory, length) => {
+        const response = realPiexImage(memory, length);
+        response.preview.orientation = 8;
         return response;
       };
     })();