--- a/devtools/server/actors/layout.js
+++ b/devtools/server/actors/layout.js
@@ -223,37 +223,27 @@ const LayoutActor = ActorClassWithSpec(l
       }
     }
 
     return grids;
   },
 
   /**
    * Returns an array of GridActor objects for all existing grid containers found by
-   * iterating below the given rootNode and optionally including nested frames.
+   * iterating below the given rootNode and including nested frames.
    *
    * @param  {NodeActor} rootNode
-   * @param  {Boolean} traverseFrames
-   *         Whether or not we should iterate through nested frames.
    * @return {Array} An array of GridActor objects.
    */
-  getAllGrids(rootNode, traverseFrames) {
+  getAllGrids(rootNode) {
     let grids = [];
 
     if (!rootNode) {
       return grids;
     }
 
-    if (!traverseFrames) {
-      return this.getGrids(rootNode.rawNode);
-    }
-
-    for (let {document} of this.tabActor.windows) {
-      grids = [...grids, ...this.getGrids(document.documentElement)];
-    }
-
-    return grids;
+    return this.getGrids(rootNode.rawNode);
   },
 });
 
 exports.FlexboxActor = FlexboxActor;
 exports.GridActor = GridActor;
 exports.LayoutActor = LayoutActor;

--- a/devtools/server/tests/browser/browser_layout_getAllGrids.js
+++ b/devtools/server/tests/browser/browser_layout_getAllGrids.js
@@ -104,17 +104,17 @@ const GRID_FRAGMENT_DATA = {
         type: "explicit"
       }
     ]
   }
 };
 
 add_task(function* () {
   let { client, walker, layout } = yield initLayoutFrontForUrl(MAIN_DOMAIN + "grid.html");
-  let grids = yield layout.getAllGrids(walker.rootNode, true);
+  let grids = yield layout.getAllGrids(walker.rootNode);
   let grid = grids[0];
   let { gridFragments } = grid;
 
   is(grids.length, 1, "One grid was returned.");
   is(gridFragments.length, 1, "One grid fragment was returned.");
   ok(Array.isArray(gridFragments), "An array of grid fragments was returned.");
   Assert.deepEqual(gridFragments[0], GRID_FRAGMENT_DATA,
     "Got the correct grid fragment data.");

--- a/devtools/server/tests/browser/browser_layout_simple.js
+++ b/devtools/server/tests/browser/browser_layout_simple.js
@@ -25,15 +25,15 @@ add_task(function* () {
   try {
     yield layout.getAllGrids(null);
   } catch (e) {
     didThrow = true;
   }
   ok(didThrow, "An exception was thrown for a missing NodeActor in getAllGrids");
 
   let invalidNode = yield walker.querySelector(walker.rootNode, "title");
-  let grids = yield layout.getAllGrids(invalidNode, true);
+  let grids = yield layout.getAllGrids(invalidNode);
   ok(Array.isArray(grids), "An array of grids was returned");
   is(grids.length, 0, "0 grids have been returned for the invalid node");
 
   yield client.close();
   gBrowser.removeCurrentTab();
 });

--- a/devtools/shared/specs/layout.js
+++ b/devtools/shared/specs/layout.js
@@ -29,18 +29,17 @@ const layoutSpec = generateActorSpec({
       },
       response: {
         flexboxes: RetVal("array:flexbox")
       }
     },
 
     getAllGrids: {
       request: {
-        rootNode: Arg(0, "domnode"),
-        traverseFrames: Arg(1, "nullable:boolean")
+        rootNode: Arg(0, "domnode")
       },
       response: {
         grids: RetVal("array:grid")
       }
     },
   },
 });