Cleanup old/deprecated wire and native APIs

Bug: none
Change-Id: Idf9a00d8dc675e1fbc83554c487edcb2dda498c8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/30001
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>

src/fuzzers/DawnWireServerFuzzer.cpp

@@ -30,6 +30,10 @@ namespace {
 
     class DevNull : public dawn_wire::CommandSerializer {
       public:
+        size_t GetMaximumAllocationSize() const override {
+            // Some fuzzer bots have a 2GB allocation limit. Pick a value reasonably below that.
+            return 1024 * 1024 * 1024;
+        }
         void* GetCmdSpace(size_t size) override {
             if (size > buf.size()) {
                 buf.resize(size);