Convert UtilityProcess to use MojoChild/ShellConnection for the shell handshake.

content/content.gyp

Index: content/content.gyp
diff --git a/content/content.gyp b/content/content.gyp
index e36fc0bd538851069760b0115f120f050e0f34fb..d06051241f1e9d51b13ccfcb67d746fcb2347852 100644
--- a/content/content.gyp
+++ b/content/content.gyp
@@ -78,6 +78,20 @@
       'hard_dependency': 1,
     },
     {
+      # GN version: //content/public/app:gpu_manifest
+      'target_name': 'content_app_gpu_manifest',
+      'type': 'none',
+      'variables': {
+        'application_type': 'exe',
+        'application_name': 'content_gpu',
+        'source_manifest': '<(DEPTH)/content/public/app/mojo/content_gpu_manifest.json',
+      },
+      'includes': [
+        '../mojo/public/mojo_application_manifest.gypi',
+      ],
+      'hard_dependency': 1,
+    },
+    {
       # GN version: //content/public/app:renderer_manifest
       'target_name': 'content_app_renderer_manifest',
       'type': 'none',
@@ -92,13 +106,13 @@
       'hard_dependency': 1,
     },
     {
-      # GN version: //content/public/app:gpu_manifest
-      'target_name': 'content_app_gpu_manifest',
+      # GN version: //content/public/app:utility_manifest
+      'target_name': 'content_app_utility_manifest',
       'type': 'none',
       'variables': {
         'application_type': 'exe',
-        'application_name': 'content_gpu',
-        'source_manifest': '<(DEPTH)/content/public/app/mojo/content_gpu_manifest.json',
+        'application_name': 'content_utility',
+        'source_manifest': '<(DEPTH)/content/public/app/mojo/content_utility_manifest.json',
       },
       'includes': [
         '../mojo/public/mojo_application_manifest.gypi',