Revert "Remove requestLegacyExternalStorage flag"

This reverts commit e02512d7

app/build.gradle

@@ -58,7 +58,8 @@ android {
         def deepLinkSchemeValue = "fenix-dev"
         buildConfigField "String", "DEEP_LINK_SCHEME", "\"$deepLinkSchemeValue\""
         manifestPlaceholders = [
-                "deepLinkScheme": deepLinkSchemeValue
+                "deepLinkScheme": deepLinkSchemeValue,
+                "requestLegacyExternalStorage": true
         ]
 
         // Build flag for "Mozilla Online" variants. See `Config.isMozillaOnline`.
@@ -96,7 +97,8 @@ android {
             def deepLinkSchemeValue = "fenix-dev"
             buildConfigField "String", "DEEP_LINK_SCHEME", "\"$deepLinkSchemeValue\""
             manifestPlaceholders = [
-                    "deepLinkScheme": deepLinkSchemeValue
+                    "deepLinkScheme": deepLinkSchemeValue,
+                    "requestLegacyExternalStorage": false
             ]
         }
         nightly releaseTemplate >> {
@@ -104,7 +106,7 @@ android {
             buildConfigField "boolean", "USE_RELEASE_VERSIONING", "true"
             def deepLinkSchemeValue = "fenix-nightly"
             buildConfigField "String", "DEEP_LINK_SCHEME", "\"$deepLinkSchemeValue\""
-            manifestPlaceholders = ["deepLinkScheme": deepLinkSchemeValue]
+            manifestPlaceholders = ["deepLinkScheme": deepLinkSchemeValue, "requestLegacyExternalStorage": false]
         }
         beta releaseTemplate >> {
             buildConfigField "boolean", "USE_RELEASE_VERSIONING", "true"
@@ -120,7 +122,8 @@ android {
                     //  - https://issuetracker.google.com/issues/36924841
                     //  - https://issuetracker.google.com/issues/36905922
                     "sharedUserId": "org.mozilla.firefox.sharedID",
-                    "deepLinkScheme": deepLinkSchemeValue
+                    "deepLinkScheme": deepLinkSchemeValue,
+                    "requestLegacyExternalStorage": true
             ]
         }
         release releaseTemplate >> {
@@ -137,7 +140,8 @@ android {
                     //  - https://issuetracker.google.com/issues/36924841
                     //  - https://issuetracker.google.com/issues/36905922
                     "sharedUserId": "org.mozilla.firefox.sharedID",
-                    "deepLinkScheme": deepLinkSchemeValue
+                    "deepLinkScheme": deepLinkSchemeValue,
+                    "requestLegacyExternalStorage": true
             ]
         }
     }

app/src/main/AndroidManifest.xml

@@ -27,6 +27,7 @@
         android:allowBackup="false"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:requestLegacyExternalStorage="${requestLegacyExternalStorage}"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/NormalTheme"