[AW] DevUI: Remove variation keys from crash UI

Remove variation keys field from crash expandable list since it's mostly
a bunch of numbers and characters with no direct benefit for the user.

Note: that this only removes it from the UI, variation keys is still
part of CrashInfo class and still collected from crashpad and  written
to logs. They will be removed in a following CL.

Bug: 1052510
Test: Manually invoke crashes and observe the UI
Change-Id: If96f67595c5feacb731579fe1a26e92af4308048
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095575Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749534}

android_webview/nonembedded/java/res_devui/layout/crashes_list_item_body.xml

@@ -19,9 +19,6 @@
         android:paddingEnd="100dp"
         android:orientation="vertical">
 
-        <include layout="@layout/two_line_sublist_item"
-            android:id="@+id/variations"/>
-
         <include layout="@layout/two_line_sublist_item"
             android:id="@+id/upload_status"/>
 

android_webview/nonembedded/java/src/org/chromium/android_webview/devui/CrashesListActivity.java

@@ -215,7 +215,6 @@ public class CrashesListActivity extends Activity {
         }
 
         // Child View where more info about the crash is shown:
-        //    - Variation keys for the crash.
         //    - Crash report upload status.
         @Override
         public View getChildView(int groupPosition, final int childPosition, boolean isLastChild,
@@ -227,25 +226,6 @@ public class CrashesListActivity extends Activity {
             }
 
             CrashInfo crashInfo = (CrashInfo) getChild(groupPosition, childPosition);
-            // Variations keys
-            View variationsView = view.findViewById(R.id.variations);
-            setTwoLineListItemText(variationsView, "Variations",
-                    crashInfo.variations == null ? "Not available"
-                                                 : crashInfo.variations.toString());
-            variationsView.setOnLongClickListener(v -> {
-                if (crashInfo.variations != null) {
-                    ClipboardManager clipboard =
-                            (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
-                    ClipData clip =
-                            ClipData.newPlainText("variations", crashInfo.variations.toString());
-                    clipboard.setPrimaryClip(clip);
-                    // Show a toast that the text has been copied.
-                    Toast.makeText(CrashesListActivity.this, "Copied variations keys",
-                                 Toast.LENGTH_SHORT)
-                            .show();
-                }
-                return true;
-            });
 
             // Upload info
             String uploadState = uploadStateString(crashInfo.uploadState);