Auto merge of #23951 - georgeroman:return_errorstatus_from_webdriverhandlers, r=jdm

Return ErrorStatus from webdriver_handlers

<!-- Please describe your changes on the following line: -->
With `webdriver 0.40`, `ErrorStatus` implements `Deserialize`. Now we can accommodate for multiple errors occuring in `webdriver_handlers`.

---
<!-- 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

<!-- Either: -->

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23951)
<!-- Reviewable:end -->

tests/wpt/metadata/webdriver/tests/get_element_attribute/get.py.ini

@@ -2,9 +2,6 @@
   [test_boolean_attribute[video-attrs17\]]
     expected: FAIL
 
-  [test_element_not_found]
-    expected: FAIL
-
   [test_global_boolean_attributes]
     expected: FAIL
 

tests/wpt/metadata/webdriver/tests/get_element_css_value/get.py.ini

@@ -1,7 +1,4 @@
 [get.py]
-  [test_element_not_found]
-    expected: FAIL
-
   [test_no_browsing_context]
     expected: ERROR
 

tests/wpt/metadata/webdriver/tests/get_element_property/get.py.ini

@@ -5,9 +5,6 @@
   [test_idl_attribute]
     expected: FAIL
 
-  [test_element_not_found]
-    expected: FAIL
-
   [test_primitives_set_by_execute_script[42-42\]]
     expected: FAIL
 

tests/wpt/metadata/webdriver/tests/get_element_rect/get.py.ini

@@ -1,7 +1,4 @@
 [get.py]
-  [test_element_not_found]
-    expected: FAIL
-
   [test_no_browsing_context]
     expected: ERROR
 

tests/wpt/metadata/webdriver/tests/get_element_tag_name/get.py.ini

@@ -1,7 +1,4 @@
 [get.py]
-  [test_element_not_found]
-    expected: FAIL
-
   [test_no_browsing_context]
     expected: ERROR
 

tests/wpt/metadata/webdriver/tests/get_element_text/get.py.ini

@@ -1,7 +1,4 @@
 [get.py]
-  [test_getting_text_of_a_non_existant_element_is_an_error]
-    expected: FAIL
-
   [test_no_browsing_context]
     expected: ERROR
 

tests/wpt/metadata/webdriver/tests/switch_to_frame/switch.py.ini

@@ -8,18 +8,12 @@
   [test_frame_id_webelement_frame[0-foo\]]
     expected: FAIL
 
-  [test_frame_id_webelement_no_element_reference]
-    expected: FAIL
-
   [test_frame_id_number_index_out_of_bounds]
     expected: FAIL
 
   [test_frame_id_number_index[0-foo\]]
     expected: FAIL
 
-  [test_frame_id_webelement_stale_reference]
-    expected: FAIL
-
   [test_no_browsing_context]
     expected: ERROR