Revert "Add field trial testing config for password and safety check"

This reverts commit 2346288a.

Reason for revert: Suspected cause of failures of password related tests (testSelectedStoredPasswordIndexIsSameAsInShowPasswordEntryEditingView) on android-marshmallow-x86-rel and others:

https://ci.chromium.org/p/chromium/builders/ci/android-marshmallow-x86-rel/1349

Original change's description:
> Add field trial testing config for password and safety check
> 
> Make sure that tests which were not meant for Safety Check explicitly
> disable the feature.
> 
> Bug: 1070620, 1092444
> Change-Id: I83ba782b73cff33f6b4b6f5afa0df9d9e4db2fd6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410866
> Auto-Submit: Ioana Pandele <ioanap@chromium.org>
> Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
> Reviewed-by: Mark Pearson <mpearson@chromium.org>
> Commit-Queue: Ioana Pandele <ioanap@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#807803}

TBR=mpearson@chromium.org,ioanap@chromium.org,chouinard@chromium.org

Change-Id: Ia51936bc2889d9fc9a8423f8d3c3186358fb045d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1070620
Bug: 1092444
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416930Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807928}

chrome/android/javatests/src/org/chromium/chrome/browser/settings/MainSettingsFragmentTest.java

@@ -143,14 +143,9 @@ public class MainSettingsFragmentTest {
         Mockito.doReturn(SEARCH_ENGINE_SHORT_NAME).when(mMockSearchEngine).getShortName();
     }
 
-    /**
-     *  TODO(crbug.com/1128924): Add a corresponding test case to support Safety Check being
-     * enabled.
-     */
     @Test
     @LargeTest
     @Feature({"RenderTest"})
-    @DisableFeatures({ChromeFeatureList.SAFETY_CHECK_ANDROID})
     public void testRenderDifferentSignedInStates() throws IOException {
         launchSettingsActivity();
         View view = mSettingsActivityTestRule.getActivity()
@@ -166,12 +161,9 @@ public class MainSettingsFragmentTest {
 
     /**
      * Test for the "Account" section.
-     *
-     * TODO(crbug.com/1128924): Add a corresponding test case to support Safety Check being enabled.
      */
     @Test
     @SmallTest
-    @DisableFeatures({ChromeFeatureList.SAFETY_CHECK_ANDROID})
     public void testStartup() {
         launchSettingsActivity();
 
@@ -215,13 +207,10 @@ public class MainSettingsFragmentTest {
 
     /**
      * Test for the "Account" section.
-     *
-     * TODO(crbug.com/1128924): Add a corresponding test case to support Safety Check being enabled.
      */
     @Test
     @SmallTest
     @Features.EnableFeatures({ChromeFeatureList.MOBILE_IDENTITY_CONSISTENCY})
-    @DisableFeatures({ChromeFeatureList.SAFETY_CHECK_ANDROID})
     public void testStartupWithMobileIdentityConsistency() {
         launchSettingsActivity();
 

testing/variations/fieldtrial_testing_config.json

@@ -6283,22 +6283,6 @@
             ]
         }
     ],
-    "SafetyAndPasswordCheckAndroid": [
-        {
-            "platforms": [
-                "android"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "PasswordCheck",
-                        "SafetyCheckAndroid"
-                    ]
-                }
-            ]
-        }
-    ],
     "SafetyCheckChromeCleanerChild": [
         {
             "platforms": [