Remove SwiftInfo.module_name, it was deprecated a while ago.

RELNOTES: None
PiperOrigin-RevId: 348027802

swift/internal/providers.bzl

@@ -33,15 +33,6 @@ library that directly propagated this provider.
         "direct_modules": """\
 `List` of values returned from `swift_common.create_module`. The modules (both
 Swift and C/Objective-C) emitted by the library that propagated this provider.
-""",
-        "module_name": """\
-`String`. The name of the Swift module represented by the target that directly
-propagated this provider.
-
-This field will be equal to the explicitly assigned module name (if present);
-otherwise, it will be equal to the autogenerated module name.
-
-This field is deprecated; use `direct_modules` instead.
 """,
         "swift_version": """\
 `String`. The version of the Swift language that was used when compiling the
@@ -346,8 +337,6 @@ def create_swift_info(
     return SwiftInfo(
         direct_defines = defines,
         direct_modules = modules,
-        # TODO(b/149999519): Remove the legacy `module_name`.
-        module_name = modules[0].name if len(modules) == 1 else None,
         swift_version = swift_version,
         transitive_defines = depset(defines, transitive = transitive_defines),
         transitive_modules = depset(modules, transitive = transitive_modules),

swift/internal/swift_module_alias.bzl

@@ -34,13 +34,6 @@ def _swift_module_alias_impl(ctx):
         for module in dep[SwiftInfo].direct_modules
     }
 
-    # TODO(b/149999519): remove the support for SwiftInfo.module_name that
-    # didn't have any direct_modules.
-    for dep in deps:
-        swift_info = dep[SwiftInfo]
-        if not swift_info.direct_modules and swift_info.module_name:
-            module_mapping[swift_info.module_name] = dep.label
-
     module_name = ctx.attr.module_name
     if not module_name:
         module_name = swift_common.derive_module_name(ctx.label)