Fix:

undefined method `exists?' for class File (NoMethodError)

https://bugs.webkit.org/show_bug.cgi?id=246743
https://github.com/WebKit/WebKit/commit/b7ac5d0ccc7ca3ed6bf4f2d40fde60247ce87d3c
--- Source/JavaScriptCore/offlineasm/config.rb
+++ Source/JavaScriptCore/offlineasm/config.rb
@@ -22,11 +22,11 @@
 # THE POSSIBILITY OF SUCH DAMAGE.
 
 buildProductsDirectory = ENV['BUILT_PRODUCTS_DIR'];
-if buildProductsDirectory and File.exists?(buildProductsDirectory)
+if buildProductsDirectory and File.exist?(buildProductsDirectory)
     $: << "#{buildProductsDirectory}/usr/local/include/WebKitAdditions/Scripts"
 end
 sdkRootDirectory = ENV['SDKROOT'];
-if sdkRootDirectory and File.exists?(sdkRootDirectory)
+if sdkRootDirectory and File.exist?(sdkRootDirectory)
     $: << "#{sdkRootDirectory}/usr/local/include/WebKitAdditions/Scripts"
 end
 
--- Source/WebInspectorUI/Scripts/update-LegacyInspectorBackendCommands.rb
+++ Source/WebInspectorUI/Scripts/update-LegacyInspectorBackendCommands.rb
@@ -36,7 +36,7 @@
       end
 
       generated_path = File.join tmpdir, output_filename
-      if !File.exists?(generated_path)
+      if !File.exist?(generated_path)
         puts "ERROR: Generated file does not exist at expected path."
         exit 1
       end