Remove deprecated APIs

Remove the Parser classes from the wgsl and spirv namespaces.
These have been replaced with a Parse() method.

Remove the TypeDeterminer::Run() method, this was not called by tint and
the TypeDeterminer is now non-public API.

Change-Id: I5ddb82768da04398ab3958d1647be44f9fe30c21
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/41840
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: dan sinclair <dsinclair@chromium.org>

src/ast/module_clone_test.cc

@@ -120,9 +120,7 @@ const declaration_order_check_3 : i32 = 1;
 )");
 
   // Parse the wgsl, create the src program
-  reader::wgsl::Parser parser(&file);
-  ASSERT_TRUE(parser.Parse()) << parser.error();
-  auto src = parser.program();
+  auto src = reader::wgsl::Parse(&file);
 
   ASSERT_TRUE(src.IsValid()) << diag::Formatter().format(src.Diagnostics());