Revert of Enable PassiveDocumentEventListeners on waterfall. (patchset #2...

Revert of Enable PassiveDocumentEventListeners on waterfall. (patchset #2 id:20001 of https://codereview.chromium.org/2119403002/ )

Reason for revert:
Revert this for now. We are seeing cc:scheduler changes as a result of this and we need to understand them better and I'm not going to be in the office the next two days.

Original issue's description:
> Enable PassiveDocumentEventListeners on waterfall.
>
> Enable passive document event listeners finch experimentl on waterfall.
>
> BUG=625675
> R=rkaplow@chromium.org
>
> Committed: https://crrev.com/19233086ad7e2363e7e1d14582dc6a5428816169
> Cr-Commit-Position: refs/heads/master@{#404351}

TBR=rkaplow@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=625675

Review-Url: https://codereview.chromium.org/2149673002
Cr-Commit-Position: refs/heads/master@{#405240}

testing/variations/fieldtrial_testing_config_android.json

@@ -260,14 +260,6 @@
             "group_name": "Enabled"
         }
     ],
-    "PassiveDocumentEventListeners": [
-        {
-            "enable_features": [
-                "PassiveDocumentEventListeners"
-            ],
-            "group_name": "Enabled"
-        }
-    ],
     "PasswordBranding": [
         {
             "group_name": "SmartLockBrandingSavePromptOnly"

testing/variations/fieldtrial_testing_config_chromeos.json

@@ -128,14 +128,6 @@
             "group_name": "Enabled"
         }
     ],
-    "PassiveDocumentEventListeners": [
-        {
-            "enable_features": [
-                "PassiveDocumentEventListeners"
-            ],
-            "group_name": "Enabled"
-        }
-    ],
     "PasswordBranding": [
         {
             "group_name": "SmartLockBrandingSavePromptOnly"

testing/variations/fieldtrial_testing_config_linux.json

@@ -159,14 +159,6 @@
             "group_name": "Enabled"
         }
     ],
-    "PassiveDocumentEventListeners": [
-        {
-            "enable_features": [
-                "PassiveDocumentEventListeners"
-            ],
-            "group_name": "Enabled"
-        }
-    ],
     "PasswordBranding": [
         {
             "group_name": "SmartLockBrandingSavePromptOnly"

testing/variations/fieldtrial_testing_config_mac.json

@@ -196,14 +196,6 @@
             "group_name": "Enabled"
         }
     ],
-    "PassiveDocumentEventListeners": [
-        {
-            "enable_features": [
-                "PassiveDocumentEventListeners"
-            ],
-            "group_name": "Enabled"
-        }
-    ],
     "PasswordBranding": [
         {
             "group_name": "SmartLockBrandingSavePromptOnly"

testing/variations/fieldtrial_testing_config_win.json

@@ -234,14 +234,6 @@
             "group_name": "Enabled"
         }
     ],
-    "PassiveDocumentEventListeners": [
-        {
-            "enable_features": [
-                "PassiveDocumentEventListeners"
-            ],
-            "group_name": "Enabled"
-        }
-    ],
     "PasswordBranding": [
         {
             "group_name": "SmartLockBrandingSavePromptOnly"