Refactor (many) IPC tests, notably most of the multiprocess tests.

ipc/ipc.gyp

Index: ipc/ipc.gyp
diff --git a/ipc/ipc.gyp b/ipc/ipc.gyp
index edc53a44c7194b33d85ca99dc835be1615f743c3..5e2f3a75203066c0701027d1fb1d99d6fde055d3 100644
--- a/ipc/ipc.gyp
+++ b/ipc/ipc.gyp
@@ -18,7 +18,7 @@
       },
       'dependencies': [
         '../base/base.gyp:base',
-        # TODO(vtl): Needed for base/lazy_instance.h, which is suspect.
+        # TODO(viettrungluu): Needed for base/lazy_instance.h, which is suspect.
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
       ],
       # TODO(gregoryd): direct_dependent_settings should be shared with the
@@ -151,7 +151,8 @@
           },
           'dependencies': [
             '../base/base.gyp:base_nacl_win64',
-            # TODO(vtl): Needed for base/lazy_instance.h, which is suspect.
+            # TODO(viettrungluu): Needed for base/lazy_instance.h, which is
+            # suspect.
             '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations_win64',
           ],
           # TODO(gregoryd): direct_dependent_settings should be shared with the