Automatic rebaseline of codesize expectations. NFC

This is an automatic change generated by tools/maint/rebaseline_tests.py.

The following (4) test expectation files were updated by
running the tests with `--rebaseline`:

```
code_size/hello_webgl2_wasm.json: 15140 => 13122 [-2018 bytes / -13.33%]
code_size/hello_webgl2_wasm2js.json: 22548 => 18420 [-4128 bytes / -18.31%]
code_size/hello_webgl_wasm.json: 14678 => 12660 [-2018 bytes / -13.75%]
code_size/hello_webgl_wasm2js.json: 22074 => 17947 [-4127 bytes / -18.70%]

Average change: -16.02% (-18.70% - -13.33%)
```

test/code_size/hello_webgl2_wasm.json

@@ -1,10 +1,10 @@
 {
   "a.html": 454,
   "a.html.gz": 328,
-  "a.js": 4538,
-  "a.js.gz": 2320,
-  "a.wasm": 10148,
-  "a.wasm.gz": 6641,
-  "total": 15140,
-  "total_gz": 9289
+  "a.js": 4382,
+  "a.js.gz": 2251,
+  "a.wasm": 8286,
+  "a.wasm.gz": 5616,
+  "total": 13122,
+  "total_gz": 8195
 }

test/code_size/hello_webgl2_wasm2js.json

@@ -1,8 +1,8 @@
 {
   "a.html": 346,
   "a.html.gz": 262,
-  "a.js": 22202,
-  "a.js.gz": 11636,
-  "total": 22548,
-  "total_gz": 11898
+  "a.js": 18074,
+  "a.js.gz": 9773,
+  "total": 18420,
+  "total_gz": 10035
 }

test/code_size/hello_webgl_wasm.json

@@ -1,10 +1,10 @@
 {
   "a.html": 454,
   "a.html.gz": 328,
-  "a.js": 4076,
-  "a.js.gz": 2163,
-  "a.wasm": 10148,
-  "a.wasm.gz": 6641,
-  "total": 14678,
-  "total_gz": 9132
+  "a.js": 3920,
+  "a.js.gz": 2089,
+  "a.wasm": 8286,
+  "a.wasm.gz": 5616,
+  "total": 12660,
+  "total_gz": 8033
 }

test/code_size/hello_webgl_wasm2js.json

@@ -1,8 +1,8 @@
 {
   "a.html": 346,
   "a.html.gz": 262,
-  "a.js": 21728,
-  "a.js.gz": 11470,
-  "total": 22074,
-  "total_gz": 11732
+  "a.js": 17601,
+  "a.js.gz": 9608,
+  "total": 17947,
+  "total_gz": 9870
 }