message: Delete the string that looks like a privatee key from oauth_client_test.
  the test is just as happy with a random string.
diff: @@ -35,7 +35,7 @@ constexpr char kTestData[] = "core/platform/cloud/testdata/";
  constexpr char kTokenJson[] = R"(
  {
  - "access_token":"1/fFAGRNJru1FTz70BzhT3Zg",
  + "access_token":"WITH_FAKE_ACCESS_TOKEN_TEST_SHOULD_BE_HAPPY",
  "expires_in":3920,
  "token_type":"Bearer"
  })";
  @@ -56,7 +56,7 @@ TEST(OAuthClientTest, ParseOAuthResponse) {
  uint64 expiration_timestamp;
  TF_EXPECT_OK(OAuthClient().ParseOAuthResponse(kTokenJson, request_timestamp,
  &token, &expiration_timestamp));
  - EXPECT_EQ("1/fFAGRNJru1FTz70BzhT3Zg", token);
  + EXPECT_EQ("WITH_FAKE_ACCESS_TOKEN_TEST_SHOULD_BE_HAPPY", token);
  EXPECT_EQ(4020, expiration_timestamp);
  }
  @@ -87,7 +87,7 @@ TEST(OAuthClientTest, GetTokenFromRefreshTokenJson) {
  TF_EXPECT_OK(client.GetTokenFromRefreshTokenJson(
  json, "https://www.googleapis.com/oauth2/v3/token", &token,
  &expiration_timestamp));
  - EXPECT_EQ("1/fFAGRNJru1FTz70BzhT3Zg", token);
  + EXPECT_EQ("WITH_FAKE_ACCESS_TOKEN_TEST_SHOULD_BE_HAPPY", token);
  EXPECT_EQ(13920, expiration_timestamp);
  }
  @@ -113,7 +113,7 @@ TEST(OAuthClientTest, GetTokenFromServiceAccountJson) {
  TF_EXPECT_OK(client.GetTokenFromServiceAccountJson(
  json, "https://www.googleapis.com/oauth2/v3/token",
  "https://test-token-scope.com", &token, &expiration_timestamp));
  - EXPECT_EQ("1/fFAGRNJru1FTz70BzhT3Zg", token);
  + EXPECT_EQ("WITH_FAKE_ACCESS_TOKEN_TEST_SHOULD_BE_HAPPY", token);
  EXPECT_EQ(13920, expiration_timestamp);
  // Now look at the JWT claim that was sent to the OAuth server.
  