Reland "[Password Manager] Cleanup feature: Migrate Linux to LoginDB"

This reverts commit 341d33c3.

Reason for reland: The preceding CL was also relanded.

Original change's description:
> Revert "[Password Manager] Cleanup feature: Migrate Linux to LoginDB"
> 
> This reverts commit 3a84c395.
> 
> Reason for revert: https://chromium-review.googlesource.com/c/chromium/src/+/1713560 didn't stick, see https://bugs.chromium.org/p/chromium/issues/detail?id=988010
> 
> Original change's description:
> > [Password Manager] Cleanup feature: Migrate Linux to LoginDB
> > 
> > The migration has been completed and the feature is no longer used.
> > 
> > Bug: 950269
> > Change-Id: I91f79f33ccda95e75d2b6156ade5d44f2e27c0ae
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719008
> > Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
> > Commit-Queue: Christos Froussios <cfroussios@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#681244}
> 
> TBR=vasilii@chromium.org,cfroussios@chromium.org
> 
> Change-Id: Ic0733620d3ebca563f5fa0be9f60742770eacd45
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 950269
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1721290
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#681347}

TBR=vasilii@chromium.org,cfroussios@chromium.org,jbudorick@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 950269
Change-Id: Ifb49e8c9a6feeeaaa6e097296dda46540df66f30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724527Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682202}

chrome/browser/about_flags.cc

@@ -2237,10 +2237,6 @@ const FeatureEntry kFeatureEntries[] = {
 #endif  // BUILDFLAG(ENABLE_ANDROID_NIGHT_MODE)
 #endif  // OS_ANDROID
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-    {"passwords-migrate-linux-to-login-db",
-     flag_descriptions::kPasswordsMigrateLinuxToLoginDBName,
-     flag_descriptions::kPasswordsMigrateLinuxToLoginDBDescription, kOsLinux,
-     FEATURE_VALUE_TYPE(password_manager::features::kMigrateLinuxToLoginDB)},
     {"enable-dbus-and-x11-status-icons",
      flag_descriptions::kEnableDbusAndX11StatusIconsName,
      flag_descriptions::kEnableDbusAndX11StatusIconsDescription, kOsLinux,

chrome/browser/flag_descriptions.cc

@@ -1538,12 +1538,6 @@ const char kPasswordImportName[] = "Password import";
 const char kPasswordImportDescription[] =
     "Import functionality in password settings.";
 
-const char kPasswordsMigrateLinuxToLoginDBName[] =
-    "Migrate passwords to \"Login Data\"";
-const char kPasswordsMigrateLinuxToLoginDBDescription[] =
-    "Performs a one-off irreversible migration of passwords from the "
-    "gnome-keyring or kwallet into the profile directory.";
-
 const char kPeriodicBackgroundSyncName[] = "Periodic Background Sync";
 const char kPeriodicBackgroundSyncDescription[] =
     "If enabled, web apps can periodically sync content in the background.";

chrome/browser/flag_descriptions.h

@@ -921,9 +921,6 @@ extern const char kPassiveDocumentWheelEventListenersDescription[];
 extern const char kPasswordImportName[];
 extern const char kPasswordImportDescription[];
 
-extern const char kPasswordsMigrateLinuxToLoginDBName[];
-extern const char kPasswordsMigrateLinuxToLoginDBDescription[];
-
 extern const char kPeriodicBackgroundSyncName[];
 extern const char kPeriodicBackgroundSyncDescription[];
 

components/password_manager/core/common/password_manager_features.cc

@@ -48,11 +48,6 @@ const base::Feature kLeakDetection = {"PasswordLeakDetection",
 const base::Feature kManualPasswordGenerationAndroid{
     "ManualPasswordGenerationAndroid", base::FEATURE_DISABLED_BY_DEFAULT};
 
-// Performs a one-off migration (with retries) from a native backend into
-// logindb. Passwords are served from the new location.
-const base::Feature kMigrateLinuxToLoginDB = {"migrate-linux-to-logindb",
-                                              base::FEATURE_ENABLED_BY_DEFAULT};
-
 // Enables new password form parsing mechanism for filling passwords, details in
 // https://goo.gl/QodPH1
 const base::Feature kNewPasswordFormParsing = {

components/password_manager/core/common/password_manager_features.h

@@ -25,7 +25,6 @@ extern const base::Feature kGenerationNoOverwrites;
 extern const base::Feature kGooglePasswordManager;
 extern const base::Feature kLeakDetection;
 extern const base::Feature kManualPasswordGenerationAndroid;
-extern const base::Feature kMigrateLinuxToLoginDB;
 extern const base::Feature kNewPasswordFormParsing;
 extern const base::Feature kNewPasswordFormParsingForSaving;
 extern const base::Feature kOnlyNewParser;