[iOS] Disable Context Menus when in Edit Mode

Fixes the bad behavior in three components:
- History
- Reading List
- Bookmarks

Bug: 1093302
Change-Id: Ia81bfd270e898c3061eb7ad061cc5aea338dc947
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2349270Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796964}

ios/chrome/browser/ui/bookmarks/bookmark_home_view_controller.mm

@@ -2171,6 +2171,11 @@ std::vector<GURL> GetUrlsToOpen(const std::vector<const BookmarkNode*>& nodes) {
     return nil;
   }
 
+  if (self.sharedState.currentlyInEditMode) {
+    // Don't show the context menu when currently in editing mode.
+    return nil;
+  }
+
   if (![self canShowContextMenuFor:indexPath]) {
     return nil;
   }

ios/chrome/browser/ui/history/history_table_view_controller.mm

@@ -625,6 +625,11 @@ const CGFloat kButtonHorizontalPadding = 30.0;
     return nil;
   }
 
+  if (self.isEditing) {
+    // Don't show the context menu when currently in editing mode.
+    return nil;
+  }
+
   HistoryEntryItem* entry = base::mac::ObjCCastStrict<HistoryEntryItem>(
       [self.tableViewModel itemAtIndexPath:indexPath]);
   UIView* cell = [self.tableView cellForRowAtIndexPath:indexPath];

ios/chrome/browser/ui/reading_list/reading_list_table_view_controller.mm

@@ -316,6 +316,11 @@ ReadingListSelectionState GetSelectionStateForSelectedCounts(
     return nil;
   }
 
+  if (self.isEditing) {
+    // Don't show the context menu when currently in editing mode.
+    return nil;
+  }
+
   return [self.menuProvider
       contextMenuConfigurationForItem:[self.tableViewModel
                                           itemAtIndexPath:indexPath]