message: Replace usage of base::GetFlag with Abseil Flags public API absl::GetFlag.
diff: @@ -588,6 +588,7 @@ cc_library(
  "//tensorflow/core/platform/default/build_config:other",
  "//tensorflow/core/platform/default/build_config:platformlib",
  "//tensorflow/core/platform/default/build_config:port",
  + "@com_google_absl//absl/flags:flag",
  ],
  )
  @@ -2155,6 +2156,7 @@ cc_library(
  ":lib_proto_parsing",
  ":abi",
  ":core_stringpiece",
  + "@com_google_absl//absl/flags:flag",
  "//third_party/eigen3",
  "//tensorflow/core/platform/default/build_config:platformlib",
  "@snappy",
  