Remove nonexempt field trials from POLICY_EXEMPT_FIELD_TRIALS

These were added in [1, 2] but are not exempt from the policy.

[1] https://webrtc-review.googlesource.com/c/src/+/322602
[2] https://webrtc-review.googlesource.com/c/src/+/324021

Bug: webrtc:15530, webrtc:15585
Change-Id: Icaa1dae6b0aaa7307f650e63d831d685b14e6853
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/339561
Auto-Submit: Emil Lundmark <lndmrk@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41775}
diff --git a/experiments/field_trials.py b/experiments/field_trials.py
index 57e03dd..6c935ea 100755
--- a/experiments/field_trials.py
+++ b/experiments/field_trials.py
@@ -116,6 +116,9 @@
     FieldTrial('WebRTC-PreventSsrcGroupsWithUnexpectedSize',
                'chromium:1459124',
                date(2024, 4, 1)),
+    FieldTrial('WebRTC-ReceiveBufferSize',
+               'webrtc:15585',
+               date(2024, 4, 1)),
     FieldTrial('WebRTC-RtcEventLogEncodeDependencyDescriptor',
                'webrtc:14975',
                date(2024, 4, 1)),
@@ -134,6 +137,9 @@
     FieldTrial('WebRTC-TaskQueue-ReplaceLibeventWithStdlib',
                'webrtc:14389',
                date(2024, 4, 1)),
+    FieldTrial('WebRTC-VP8-MaxFrameInterval',
+               'webrtc:15530',
+               date(2024, 4, 1)),
     FieldTrial('WebRTC-Video-EnableRetransmitAllLayers',
                'webrtc:14959',
                date(2024, 4, 1)),
@@ -736,9 +742,6 @@
     FieldTrial('WebRTC-SendBufferSizeBytes',
                'webrtc:11905',
                date(2024, 4, 1)),
-    FieldTrial('WebRTC-ReceiveBufferSize',
-               'webrtc:15585',
-               date(2024, 4, 1)),
     FieldTrial('WebRTC-SendNackDelayMs',
                'webrtc:9953',
                date(2024, 4, 1)),
@@ -808,9 +811,6 @@
     FieldTrial('WebRTC-VP8-GetEncoderInfoOverride',
                'webrtc:11832',
                INDEFINITE),
-    FieldTrial('WebRTC-VP8-MaxFrameInterval',
-               'webrtc:15530',
-               date(2024, 4, 1)),
     FieldTrial('WebRTC-VP8-Postproc-Config',
                'webrtc:11551',
                date(2024, 4, 1)),