GN: Use build directory for CD for scripts

tools/gn/variables.h

Index: tools/gn/variables.h
diff --git a/tools/gn/variables.h b/tools/gn/variables.h
index cdb50e67de5977a1fa9e9b7b917051f9e6f8c2b3..7fb50cf7bfef9ee4efc937fcd0e318d721072087 100644
--- a/tools/gn/variables.h
+++ b/tools/gn/variables.h
@@ -41,38 +41,22 @@ extern const char kPythonPath[];
 extern const char kPythonPath_HelpShort[];
 extern const char kPythonPath_Help[];
 
-extern const char kRelativeBuildToSourceRootDir[];
-extern const char kRelativeBuildToSourceRootDir_HelpShort[];
-extern const char kRelativeBuildToSourceRootDir_Help[];
-
-extern const char kRelativeRootGenDir[];
-extern const char kRelativeRootGenDir_HelpShort[];
-extern const char kRelativeRootGenDir_Help[];
-
-extern const char kRelativeRootOutputDir[];
-extern const char kRelativeRootOutputDir_HelpShort[];
-extern const char kRelativeRootOutputDir_Help[];
-
-extern const char kRelativeSourceRootDir[];
-extern const char kRelativeSourceRootDir_HelpShort[];
-extern const char kRelativeSourceRootDir_Help[];
-
-extern const char kRelativeTargetGenDir[];
-extern const char kRelativeTargetGenDir_HelpShort[];
-extern const char kRelativeTargetGenDir_Help[];
-
-extern const char kRelativeTargetOutputDir[];
-extern const char kRelativeTargetOutputDir_HelpShort[];
-extern const char kRelativeTargetOutputDir_Help[];
-
 extern const char kRootGenDir[];
 extern const char kRootGenDir_HelpShort[];
 extern const char kRootGenDir_Help[];
 
+extern const char kRootOutDir[];
+extern const char kRootOutDir_HelpShort[];
+extern const char kRootOutDir_Help[];
+
 extern const char kTargetGenDir[];
 extern const char kTargetGenDir_HelpShort[];
 extern const char kTargetGenDir_Help[];
 
+extern const char kTargetOutDir[];
+extern const char kTargetOutDir_HelpShort[];
+extern const char kTargetOutDir_Help[];
+
 // Target vars -----------------------------------------------------------------
 
 extern const char kAllDependentConfigs[];