Auto merge of #15653 - samliu:cleanup_arraybufferview_type, r=cbrewster

Cleanup arraybufferview type

<!-- Please describe your changes on the following line: -->
Replace uses of spidermonkey-specific JS_GetArrayBufferViewType with ArrayBufferView impl's method get_array_type().

Tests pass:
./mach test-wpt tests/wpt/web-platform-tests/WebCrypto
./mach test-wpt tests/wpt/web-platform-tests/webgl

---
<!-- 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 #15605 (github issue number if applicable).
- [x] There are tests for these changes

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Cargo.lock

@@ -1260,7 +1260,7 @@ dependencies = [
 [[package]]
 name = "js"
 version = "0.1.4"
-source = "git+https://github.com/servo/rust-mozjs#93e59ef1263e451143d0ed431f1aa564ea101ab8"
+source = "git+https://github.com/servo/rust-mozjs#101c6b6b58e0b7c5ed1ef2b6b676a7497f90df2f"
 dependencies = [
  "cmake 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",