Rename variable for consistency.

common/config.gni

@@ -24,7 +24,7 @@ declare_args() {
   flutter_prebuilt_dart_sdk = false
 
   # Whether to build the flutter web sdk outline/DDC artifacts.
-  build_flutter_web_sdk = false
+  flutter_build_web_sdk = false
 }
 
 # feature_defines_list ---------------------------------------------------------

tools/gn

@@ -257,7 +257,7 @@ def to_gn_args(args):
     to_gn_wasm_args(args, gn_args)
     return gn_args
 
-  gn_args['build_flutter_web_sdk'] = args.build_web_sdk
+  gn_args['flutter_build_web_sdk'] = args.build_web_sdk
   gn_args['full_dart_sdk'] = args.full_dart_sdk
   if args.build_web_sdk or args.full_dart_sdk:
     gn_args['build_canvaskit'] = args.build_canvaskit
@@ -639,7 +639,7 @@ def to_gn_wasm_args(args, gn_args):
   # than forced to true, once the recipes are updated.
   # https://github.com/flutter/flutter/issues/113303
   gn_args['build_canvaskit'] = True
-  gn_args['build_flutter_web_sdk'] = True
+  gn_args['flutter_build_web_sdk'] = True
 
 
 def parse_args(args):

wasm/BUILD.gn

@@ -10,7 +10,7 @@ import("//flutter/common/config.gni")
 
 # This is the default target when building when the target CPU is WASM.
 group("wasm") {
-  if (build_flutter_web_sdk) {
+  if (flutter_build_web_sdk) {
     deps = [ "//flutter/web_sdk" ]
   }
 }