tests: remove no-remap-src-base

Previously in the `//`-compiletest-directive times, this was implemented
as a special `no-*` directive parsing. In the migration from `//` ->
`//@`, the `// no-remap-src-base` directive was lost, most likely
because it had no effect -- the default is not remapping `src-base`.

So remove occurrences of `no-remap-src-base`, as these are not valid
directives.

tests/ui-fulldeps/mod_dir_path_canonicalized.rs

@@ -2,7 +2,6 @@
 // Testing that a librustc_ast can parse modules with canonicalized base path
 //@ ignore-cross-compile
 //@ ignore-remote
-// no-remap-src-base: Reading `file!()` (expectedly) fails when enabled.
 
 #![feature(rustc_private)]
 

tests/ui/errors/auxiliary/remapped_dep.rs

@@ -1,4 +1,4 @@
 //@ compile-flags: --remap-path-prefix={{src-base}}/errors/auxiliary=remapped-aux
-// no-remap-src-base: Manually remap, so the remapped path remains in .stderr file.
+// Manually remap, so the remapped path remains in .stderr file.
 
 pub struct SomeStruct {} // This line should be show as part of the error.

tests/ui/errors/remap-path-prefix-reverse.local-self.stderr

@@ -1,5 +1,5 @@
 error[E0423]: expected value, found struct `remapped_dep::SomeStruct`
-  --> $DIR/remap-path-prefix-reverse.rs:16:13
+  --> $DIR/remap-path-prefix-reverse.rs:15:13
    |
 LL |     let _ = remapped_dep::SomeStruct;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: use struct literal syntax instead: `remapped_dep::SomeStruct {}`

tests/ui/errors/remap-path-prefix-reverse.remapped-self.stderr

@@ -1,5 +1,5 @@
 error[E0423]: expected value, found struct `remapped_dep::SomeStruct`
-  --> $DIR/remap-path-prefix-reverse.rs:16:13
+  --> $DIR/remap-path-prefix-reverse.rs:15:13
    |
 LL |     let _ = remapped_dep::SomeStruct;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: use struct literal syntax instead: `remapped_dep::SomeStruct {}`

tests/ui/errors/remap-path-prefix-reverse.rs

@@ -2,7 +2,6 @@
 //@ compile-flags: --remap-path-prefix={{src-base}}/errors/auxiliary=remapped-aux
 
 //@ revisions: local-self remapped-self
-// [local-self] no-remap-src-base: The hack should work regardless of remapping.
 //@ [remapped-self] remap-src-base
 
 // Verify that the expected source code is shown.

tests/ui/errors/remap-path-prefix.rs

@@ -2,7 +2,7 @@
 //@ compile-flags: --remap-path-prefix={{src-base}}=remapped
 //@ [with-diagnostic-scope]compile-flags: -Zremap-path-scope=diagnostics
 //@ [without-diagnostic-scope]compile-flags: -Zremap-path-scope=object
-// no-remap-src-base: Manually remap, so the remapped path remains in .stderr file.
+// Manually remap, so the remapped path remains in .stderr file.
 
 // The remapped paths are not normalized by compiletest.
 //@ normalize-stderr: "\\(errors)" -> "/$1"

tests/ui/proc-macro/expand-expr.rs

@@ -1,6 +1,6 @@
 //@ proc-macro: expand-expr.rs
 //@ ignore-backends: gcc
-// no-remap-src-base: check_expand_expr_file!() fails when enabled.
+// No `remap-src-base`, since `check_expand_expr_file!()` fails when enabled.
 
 #![feature(concat_bytes)]
 extern crate expand_expr;

tests/ui/proc-macro/pretty-print-hack-show.rs

@@ -1,7 +1,6 @@
 //@ proc-macro: test-macros.rs
 //@ compile-flags: -Z span-debug
 //@ revisions: local remapped
-// [local] no-remap-src-base: The hack should work regardless of remapping.
 //@ [remapped] remap-src-base
 
 #![no_std] // Don't load unnecessary hygiene information from std