Revert of Revive experiment to isolate shell operations.

Revert of Revive experiment to isolate shell operations. (patchset #5 id:100001 of https://codereview.chromium.org/2122303002/ )

Reason for revert:
Possibly broke compile on"Win8 GYP (dbg)"

Original issue's description:
> Isolate shell operations to the utility process.
> 
> Shell operations can cause 3rd-party shell extensions to be
> loaded into the caller's process. The utility process protects the browser process from potential instability.
> 
> Also convert the IPC mechanism to Mojo.
> 
> BUG=73098
> 
> Committed: https://crrev.com/b7faec8d94ef286d2b92144c2836b170c2cdea95
> Cr-Commit-Position: refs/heads/master@{#405270}

TBR=sky@chromium.org,dcheng@chromium.org,wfh@chromium.org,pmonette@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=73098

[nektarios, 2016-07-13 21:10:16]

The CQ bit was checked by nektar@chromium.org

[nektarios, 2016-07-13 21:10:17]

Created Revert of Revive experiment to isolate shell operations.

[commit-bot: I haz the power, 2016-07-13 21:11:29]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-13 21:13:15]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-07-13 21:13:17]

Failed to apply patch for chrome/common/shell_handler_win.typemap:
While running git rm chrome/common/shell_handler_win.typemap;
  fatal: pathspec 'chrome/common/shell_handler_win.typemap' did not match any
files

Patch:  D    chrome/common/shell_handler_win.typemap
Index: chrome/common/shell_handler_win.typemap
diff --git a/chrome/common/shell_handler_win.typemap
b/chrome/common/shell_handler_win.typemap
deleted file mode 100644
index
b7b108439fdae363265b90c1f6e3398f3e125503..0000000000000000000000000000000000000000
--- a/chrome/common/shell_handler_win.typemap
+++ /dev/null
@@ -1,11 +0,0 @@
-# Copyright 2016 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.
-
-mojom = "//chrome/common/shell_handler_win.mojom"
-public_headers = [ "//base/strings/string16.h" ]
-deps = [
-  "//base",
-]
-type_mappings = [ "mojom.FileExtensionFilters=" +
-                  "std::vector<std::tuple<base::string16, base::string16>>" ]