cx.background_executor().spawn(...) -> cx.background_spawn(...) (#25103)

Done automatically with

> ast-grep -p '$A.background_executor().spawn($B)' -r
'$A.background_spawn($B)' --update-all --globs "\!crates/gpui"

Followed by:

* `cargo fmt`
* Unexpected need to remove some trailing whitespace.
* Manually adding imports of `gpui::{AppContext as _}` which provides
`background_spawn`
* Added `AppContext as _` to existing use of `AppContext`

Release Notes:

- N/A

crates/language_models/src/provider/google.rs

@@ -330,28 +330,27 @@ pub fn count_google_tokens(
 ) -> BoxFuture<'static, Result<usize>> {
     // We couldn't use the GoogleLanguageModelProvider to count tokens because the github copilot doesn't have the access to google_ai directly.
     // So we have to use tokenizer from tiktoken_rs to count tokens.
-    cx.background_executor()
-        .spawn(async move {
-            let messages = request
-                .messages
-                .into_iter()
-                .map(|message| tiktoken_rs::ChatCompletionRequestMessage {
-                    role: match message.role {
-                        Role::User => "user".into(),
-                        Role::Assistant => "assistant".into(),
-                        Role::System => "system".into(),
-                    },
-                    content: Some(message.string_contents()),
-                    name: None,
-                    function_call: None,
-                })
-                .collect::<Vec<_>>();
+    cx.background_spawn(async move {
+        let messages = request
+            .messages
+            .into_iter()
+            .map(|message| tiktoken_rs::ChatCompletionRequestMessage {
+                role: match message.role {
+                    Role::User => "user".into(),
+                    Role::Assistant => "assistant".into(),
+                    Role::System => "system".into(),
+                },
+                content: Some(message.string_contents()),
+                name: None,
+                function_call: None,
+            })
+            .collect::<Vec<_>>();
 
-            // Tiktoken doesn't yet support these models, so we manually use the
-            // same tokenizer as GPT-4.
-            tiktoken_rs::num_tokens_from_messages("gpt-4", &messages)
-        })
-        .boxed()
+        // Tiktoken doesn't yet support these models, so we manually use the
+        // same tokenizer as GPT-4.
+        tiktoken_rs::num_tokens_from_messages("gpt-4", &messages)
+    })
+    .boxed()
 }
 
 struct ConfigurationView {