Auto merge of #23748 - saschanaz:default-dict, r=Manishearth

Sync WebIDL.py with gecko

<!-- Please describe your changes on the following line: -->

The new change requires default dictionary value for optional dictionary-type arguments.

---
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- [ ] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #23703

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- [x] There are tests for these changes

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1 files changed, 9 insertions, 9 deletions

diff --git a/components/script/dom/bindings/codegen/parser/tests/test_namespace.py b/components/script/dom/bindings/codegen/parser/tests/test_namespace.py
index 74533a1770e..62edb270c63 100644
--- a/components/script/dom/bindings/codegen/parser/tests/test_namespace.py
+++ b/components/script/dom/bindings/codegen/parser/tests/test_namespace.py
@@ -70,7 +70,7 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")
 
@@ -85,7 +85,7 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")
 
@@ -104,7 +104,7 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")
 
@@ -123,7 +123,7 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")
 
@@ -142,7 +142,7 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")
 
@@ -161,7 +161,7 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")
 
@@ -180,7 +180,7 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")
 
@@ -199,7 +199,7 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")
 
@@ -218,6 +218,6 @@ def WebIDLTest(parser, harness):
         """)
 
         results = parser.finish()
-    except Exception, x:
+    except Exception as x:
         threw = True
     harness.ok(threw, "Should have thrown.")