Revert "Restrict unsigned integer overflow in MPEG4Writer writeEdtsBox"

This reverts commit 8d72a3dfd9387eb0fbec50cd0f1f26f6deb150a2.

Bug: 312748691

Reason for revert: Test breakage

Change-Id: Ia5000fbd465bdcc20121619284f91df62ec4cfd4
diff --git a/media/libstagefright/include/media/stagefright/MPEG4Writer.h b/media/libstagefright/include/media/stagefright/MPEG4Writer.h
index 18237e5..054a4b8 100644
--- a/media/libstagefright/include/media/stagefright/MPEG4Writer.h
+++ b/media/libstagefright/include/media/stagefright/MPEG4Writer.h
@@ -77,9 +77,6 @@
     virtual void setStartTimeOffsetMs(int ms) { mStartTimeOffsetMs = ms; }
     virtual int32_t getStartTimeOffsetMs() const { return mStartTimeOffsetMs; }
     virtual status_t setNextFd(int fd);
-    bool isSampleMetadataValid([[maybe_unused]] size_t trackIndex, int64_t timeUs) override {
-        return timeUs >= 0;
-    }
 
 protected:
     virtual ~MPEG4Writer();