Revert "implement TrustedRandomAccess for Take iterator adapter"

This reverts commit 37a5b515e9.

library/core/src/iter/adapters/take.rs

@@ -1,8 +1,5 @@
 use crate::cmp;
-use crate::iter::{
-    adapters::zip::try_get_unchecked, adapters::SourceIter, FusedIterator, InPlaceIterable,
-    TrustedLen, TrustedRandomAccess,
-};
+use crate::iter::{adapters::SourceIter, FusedIterator, InPlaceIterable, TrustedLen};
 use crate::ops::{ControlFlow, Try};
 
 /// An iterator that only iterates over the first `n` iterations of `iter`.
@@ -114,15 +111,6 @@ where
 
         self.try_fold(init, ok(fold)).unwrap()
     }
-
-    unsafe fn __iterator_get_unchecked(&mut self, idx: usize) -> <I as Iterator>::Item
-    where
-        Self: TrustedRandomAccess,
-    {
-        // SAFETY: the caller must uphold the contract for
-        // `Iterator::__iterator_get_unchecked`.
-        unsafe { try_get_unchecked(&mut self.iter, idx) }
-    }
 }
 
 #[unstable(issue = "none", feature = "inplace_iteration")]
@@ -219,12 +207,3 @@ impl<I> FusedIterator for Take<I> where I: FusedIterator {}
 
 #[unstable(feature = "trusted_len", issue = "37572")]
 unsafe impl<I: TrustedLen> TrustedLen for Take<I> {}
-
-#[doc(hidden)]
-#[unstable(feature = "trusted_random_access", issue = "none")]
-unsafe impl<I> TrustedRandomAccess for Take<I>
-where
-    I: TrustedRandomAccess,
-{
-    const MAY_HAVE_SIDE_EFFECT: bool = I::MAY_HAVE_SIDE_EFFECT;
-}