Revert "Launch InternalServerSideSpeechRecognitionUSMModelFinch and ProjectorUseUSMForS3."

This reverts commit e83f25ed5f.

Reason for revert: Breaking linux-chromeos-chrome unittests

Bug: b:405476482

Original change's description:
> Launch InternalServerSideSpeechRecognitionUSMModelFinch and ProjectorUseUSMForS3.
>
> Change-Id: I2329cd529ec141b75c8d184ce6cd2f1fdd74df8f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6384287
> Reviewed-by: Benjamin Zielinski <bzielinski@google.com>
> Commit-Queue: Dorian Brandon <dorianbrandon@google.com>
> Cr-Commit-Position: refs/heads/main@{#1436321}

Change-Id: I1bdbef639891361c0aaa55cfa1c517862fdc9883
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6384570
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Michael Wojcicka <mwoj@google.com>
Cr-Commit-Position: refs/heads/main@{#1436393}

ash/constants/ash_features.cc

@@ -1625,7 +1625,7 @@ BASE_FEATURE(kInternalServerSideSpeechRecognitionByFinch,
 // S3 USM_RNNT model.
 BASE_FEATURE(kInternalServerSideSpeechRecognitionUSMModelFinch,
              "InternalServerSideSpeechRecognitionUSMModelFinch",
-             base::FEATURE_ENABLED_BY_DEFAULT);
+             base::FEATURE_DISABLED_BY_DEFAULT);
 
 // Enables sending `client-info` values to IPP printers on ChromeOS.
 BASE_FEATURE(kIppClientInfo, "IppClientInfo", base::FEATURE_ENABLED_BY_DEFAULT);
@@ -2456,7 +2456,7 @@ BASE_FEATURE(kProjectorV2, "ProjectorV2", base::FEATURE_ENABLED_BY_DEFAULT);
 // Controls whether to use USM for serverside speech recognition for projector.
 BASE_FEATURE(kProjectorUseUSMForS3,
              "ProjectorUseUSMForS3",
-             base::FEATURE_ENABLED_BY_DEFAULT);
+             base::FEATURE_DISABLED_BY_DEFAULT);
 
 // controls whether projector uses dynamic colors.
 BASE_FEATURE(kProjectorDynamicColors,

testing/variations/fieldtrial_testing_config.json

@@ -21602,6 +21602,22 @@
             ]
         }
     ],
+    "ScreencastServerBasedUSMRNNTLocales": [
+        {
+            "platforms": [
+                "chromeos"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "InternalServerSideSpeechRecognitionUSMModelFinch",
+                        "ProjectorUseUSMForS3"
+                    ]
+                }
+            ]
+        }
+    ],
     "ScrimForBrowserWindowModal": [
         {
             "platforms": [