Generate go files in the go/src directory.

Undoes a change that was never supposed to make it in a CL.

R=kulakowski@chromium.org, kulakowski

Review URL: https://codereview.chromium.org/2105593003 .

mojo/public/tools/bindings/generators/mojom_go_generator.py

diff --git a/mojo/public/tools/bindings/generators/mojom_go_generator.py b/mojo/public/tools/bindings/generators/mojom_go_generator.py
index 5ea0d5d..88d83ac 100644
--- a/mojo/public/tools/bindings/generators/mojom_go_generator.py
+++ b/mojo/public/tools/bindings/generators/mojom_go_generator.py
@@ -331,7 +331,7 @@
   def GenerateFiles(self, args):
     self.should_gen_mojom_types = "--generate_type_info" in args
 
-    self.Write(self.GenerateSource(), os.path.join(
+    self.Write(self.GenerateSource(), os.path.join("go", "src",
         GetPackagePath(self.module), "%s.go" % self.module.name))
 
   def GetJinjaParameters(self):