Set the grit .d file dir in GN build properly.

Put the .d file in the same directory as the output from grit. Currently it
uses the default location for the .d file all the time, even in cases where the
output directory is overridden and the rest of the files go somewhere else.

R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/450483004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287877 0039d316-1c4b-4281-b951-d872f2087c98

build/secondary/tools/grit/grit_rule.gni

@@ -256,7 +256,7 @@ template("grit") {
     script = "//tools/grit/grit.py"
     inputs = grit_inputs
     outputs = grit_outputs
-    depfile = "$target_out_dir/${target_name}.d"
+    depfile = "$output_dir/${target_name}.d"
 
     args = [
       "-i", source_path, "build",