Do no reuse flag USE_FRE_FLOW_SEQUENCER to infer lightweight FRE

The flag was removed after generating the full FRE sequence to avoid regenerating the sequence if the activity restarts because of device configuration changes.

BUG=626993

Review-Url: https://codereview.chromium.org/2145393004
Cr-Commit-Position: refs/heads/master@{#405999}

chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunActivity.java

@@ -48,6 +48,7 @@ public class FirstRunActivity extends AppCompatActivity implements FirstRunPageD
     // Incoming parameters:
     public static final String COMING_FROM_CHROME_ICON = "ComingFromChromeIcon";
     public static final String USE_FRE_FLOW_SEQUENCER = "UseFreFlowSequencer";
+    public static final String START_LIGHTWEIGHT_FRE = "StartLightweightFRE";
 
     static final String SHOW_WELCOME_PAGE = "ShowWelcome";
     static final String SHOW_SIGNIN_PAGE = "ShowSignIn";
@@ -141,9 +142,8 @@ public class FirstRunActivity extends AppCompatActivity implements FirstRunPageD
             mFreProperties = new Bundle();
         }
 
-        // Skip creating content view if it is a lightweight First Run Experience without using
-        // USE_FRE_FLOW_SEQUENCER.
-        if (!mFreProperties.getBoolean(FirstRunActivity.USE_FRE_FLOW_SEQUENCER)) {
+        // Skip creating content view if it is to start a lightweight First Run Experience.
+        if (mFreProperties.getBoolean(FirstRunActivity.START_LIGHTWEIGHT_FRE)) {
             return;
         }
 

chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunFlowSequencer.java

@@ -262,7 +262,7 @@ public abstract class FirstRunFlowSequencer  {
         Intent intent = new Intent();
         intent.setClassName(context, LightweightFirstRunActivity.class.getName());
         intent.putExtra(FirstRunActivity.COMING_FROM_CHROME_ICON, fromChromeIcon);
-        intent.putExtra(FirstRunActivity.USE_FRE_FLOW_SEQUENCER, false);
+        intent.putExtra(FirstRunActivity.START_LIGHTWEIGHT_FRE, true);
         return intent;
     }