Enable whole-program vtable opt when CFI is enabled.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 78c26e391bb6f409c8027c168c1b6dab9f5b045f..0ac0eea297db91a40014e1d5599cf8c10dd5e5a7 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -465,11 +465,8 @@ config("compiler") {
       ldflags += [ "-Wl,-plugin-opt,-function-sections" ]
     }
 
-    # TODO(pcc): Make these flags work correctly with CFI.
-    if (!is_cfi) {
-      cflags += [ "-fwhole-program-vtables" ]
-      ldflags += [ "-fwhole-program-vtables" ]
-    }
+    cflags += [ "-fwhole-program-vtables" ]
+    ldflags += [ "-fwhole-program-vtables" ]
   }
 
   # Pass the same C/C++ flags to the objective C/C++ compiler.