Move gn secondary_source to the build/ directory

build/secondary/third_party/angle/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This config is applied to internal Angle targets (not pushed to dependents).
 config("internal_config") {
   include_dirs = [
     "include",
     "src",
   ]
@@ skipping 263 matching lines @@
   }
 } else {
   # While Angle is being updated, we copy a temporary hardcoded commit.h. This
   # is copied both as commit.h and angle_commit.h. The angle roll will rename
   # this file from commit.h to angle_commit.h and we don't want to make the
   # udpate more complicated than necessary.
   group("commit_id") {
     deps = [ ":copy_angle_commit_h", ":copy_commit_h" ]
   }
 
-  hardcoded_commit = [ "//tools/gn/secondary/third_party/angle/angle_commit.h" ]
+  hardcoded_commit = [ "//build/secondary/third_party/angle/angle_commit.h" ]
   copy("copy_angle_commit_h") {
     sources = hardcoded_commit
     outputs = [ "$root_gen_dir/angle_commit.h" ]
   }
   copy("copy_commit_h") {
     sources = hardcoded_commit
     outputs = [ "$root_gen_dir/commit.h" ]
   }
 }
 
@@ skipping 340 matching lines @@
     include_dirs = [ "src/libGLESv2" ]
     libs = [ "d3d9.lib" ]
 
     deps = [
       ":commit_id",
       ":includes",
       ":libGLESv2",
     ]
   }
 }  # is_win