Auto merge of #11480 - rafaqtro:local_b, r=emilio

rename

<!-- Please describe your changes on the following line: -->
rename of page_fetch_complete and handle_page_fetch_complete for page_headers_available and handle_page_headers_available .

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #11418 (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11480)
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components/script/dom/servohtmlparser.rs

@@ -94,9 +94,9 @@ impl AsyncResponseListener for ParserContext {
             Err(_) => None,
         };
         let content_type = metadata.clone().and_then(|meta| meta.content_type);
-        let parser = match ScriptThread::page_fetch_complete(&self.id,
-                                                             self.subpage.as_ref(),
-                                                             metadata) {
+        let parser = match ScriptThread::page_headers_available(&self.id,
+                                                                self.subpage.as_ref(),
+                                                                metadata) {
             Some(parser) => parser,
             None => return,
         };