Revert of [ios] Pass more --jscomp_error switches to the closure Compiler.

Revert of [ios] Pass more --jscomp_error switches to the closure Compiler. (patchset #3 id:40001 of https://codereview.chromium.org/2449333002/ )

Reason for revert:
Reverting as this break the iOS autoroller and the CL was implemented by a member of the Chrome on iOS team.

Original issue's description:
> [ios] Pass more --jscomp_error switches to the closure Compiler.
> 
> 1.) Allow compiler to see __gCrWeb, __gCrWeb.autofill,
> __gCrWeb.languageDetection, __gCrWeb.suggestions, __gCrWeb.translate,
> __gCrWeb.autofill, __gCrWeb.common objects by creating them via dot
> syntax.
> 
> 2.) Made __gCrWeb.message.invokeOnHost public as it's used in other
> files.
> 
> 3.) Access windowId, via bracket syntax as it may not be defined.
> 
> 4.) Access POSTSuccessHandler and POSTErrorHandler as they are
> installed by WKWebView from the native code.
> 
> BUG=487804
> 
> Committed: https://crrev.com/cda1c632a2cbe11af48a9ef5bb7b7e568934611f
> Cr-Commit-Position: refs/heads/master@{#429344}

TBR=dpapad@chromium.org,jdonnelly@chromium.org,eugenebut@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=487804

[sdefresne, 2016-11-03 16:10:13]

The CQ bit was checked by sdefresne@chromium.org

[sdefresne, 2016-11-03 16:10:14]

Created Revert of [ios] Pass more --jscomp_error switches to the closure
Compiler.

[commit-bot: I haz the power, 2016-11-03 16:10:45]

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, 2016-11-03 16:11:27]

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

[commit-bot: I haz the power, 2016-11-03 16:11:28]

Failed to apply patch for ios/web/web_state/js/resources/common.js:
While running git apply --index -3 -p1;
  error: patch failed: ios/web/web_state/js/resources/common.js:28
  error: repository lacks the necessary blob to fall back on 3-way merge.
  error: ios/web/web_state/js/resources/common.js: patch does not apply

Patch:       ios/web/web_state/js/resources/common.js
Index: ios/web/web_state/js/resources/common.js
diff --git a/ios/web/web_state/js/resources/common.js
b/ios/web/web_state/js/resources/common.js
index
7796fc243975adf078a4d9870935b73bbc4490ee..9e13a41d752d899ce5ef2bdec164a8809cb84587
100644
--- a/ios/web/web_state/js/resources/common.js
+++ b/ios/web/web_state/js/resources/common.js
@@ -14,12 +14,7 @@
  * injected. String 'common' is used in |__gCrWeb['common']| as it needs to be
  * accessed in Objective-C code.
  */
-__gCrWeb.common = {};
-
-// Store common namespace object in a global __gCrWeb object referenced by a
-// string, so it does not get renamed by closure compiler during the
-// minification.
-__gCrWeb['common'] = __gCrWeb.common;
+__gCrWeb['common'] = {};
 
 /* Beginning of anonymous object. */
 (function() {
@@ -28,13 +23,13 @@
    * in host pages.
    * @constructor
    */
-  __gCrWeb.common.JSONSafeObject = function JSONSafeObject() {
+  __gCrWeb['common'].JSONSafeObject = function JSONSafeObject() {
   };
 
   /**
    * Protect against custom implementation of Object.toJSON in host pages.
    */
-  delete __gCrWeb.common.JSONSafeObject.prototype.toJSON;
+  __gCrWeb['common'].JSONSafeObject.prototype.toJSON = null;
 
   /**
    * Retain the original JSON.stringify method where possible to reduce the