[Mac/GN] Use the right output name for Mac frameworks.

This uses the new output_prefix_override flag to not prefix framework
shared libraries with "lib" and overrides the output_extension to be
empty.

BUG=297668

Review URL: https://codereview.chromium.org/1871143002

Cr-Original-Commit-Position: refs/heads/master@{#386692}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: c7905381e103462334ea24c20f1de670d89bd1ec

config/mac/rules.gni

@@ -54,13 +54,16 @@ template("framework_bundle") {
                              "output_name",
                              "visibility",
                            ])
+    output_name = _output_name
+    output_prefix_override = true
+    output_extension = ""
   }
 
   bundle_data(_shared_library_bundle_data) {
     visibility = [ ":$_framework_target" ]
     forward_variables_from(invoker, [ "testonly" ])
     sources = [
-      "$root_out_dir/${shlib_prefix}${_shared_library_target}${shlib_extension}",
+      "$root_out_dir/${_output_name}",
     ]
     outputs = [
       "{{bundle_executable_dir}}/$_output_name",