Use list_dart_files.py instead of list_files.py in GN build.

utils/dartanalyzer/BUILD.gn

Index: utils/dartanalyzer/BUILD.gn
diff --git a/utils/dartanalyzer/BUILD.gn b/utils/dartanalyzer/BUILD.gn
index e9d88a62fe81b070fba71b1bdab52fd29e09abc2..8f19b1ac575a1b5eab5b5b66f0aeff6c893d488d 100644
--- a/utils/dartanalyzer/BUILD.gn
+++ b/utils/dartanalyzer/BUILD.gn
@@ -12,24 +12,21 @@ group("dartanalyzer") {
   ]
 }
 
-analyzer_files = exec_script("../../tools/list_files.py",
-                             ["\\.dart\$",
-                             rebase_path("../../pkg/analyzer")],
+analyzer_files = exec_script("../../tools/list_dart_files.py",
+                             [rebase_path("../../pkg/analyzer")],
                              "list lines")
 
 application_snapshot("generate_dartanalyzer_snapshot") {
   main_dart = "../../pkg/analyzer_cli/bin/analyzer.dart"
   name = "dartanalyzer"
-  cli_files = exec_script("../../tools/list_files.py",
-                          ["\\.dart\$",
-                           rebase_path("../../pkg/analyzer_cli")],
+  cli_files = exec_script("../../tools/list_dart_files.py",
+                          [rebase_path("../../pkg/analyzer_cli")],
                           "list lines")
   inputs = cli_files + analyzer_files
 }
 
-sdk_lib_files = exec_script("../../tools/list_files.py",
-                            ["\\.dart\$",
-                             rebase_path("../../sdk/lib")],
+sdk_lib_files = exec_script("../../tools/list_dart_files.py",
+                            [rebase_path("../../sdk/lib")],
                             "list lines")
 
 template("generate_summary") {