Revert of Rework tab_capture_end2end_tests' test definition.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index c669f15f64aaee37b6b7c2da86c436a5205c2fae..8e54d5edb58e330a3a7a9d49d7b2a37f6377b3bd 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1133,6 +1133,15 @@
       "//testing/scripts/common.py",
       "//testing/xvfb.py",
       "//testing/scripts/run_telemetry_as_googletest.py",
+    ]
+  }
+
+  # TODO(GYP_GONE): Delete this after we've converted everything to GN.
+  # This target exist only for compatibility w/ GYP.
+  group("tab_capture_end2end_tests") {
+    testonly = true
+    deps = [
+      ":browser_tests",
     ]
   }
 }