linux and chromeos: Turn on -Wunused-const-variable.

chrome/browser/chromeos/login/login_utils_browsertest.cc

Index: chrome/browser/chromeos/login/login_utils_browsertest.cc
diff --git a/chrome/browser/chromeos/login/login_utils_browsertest.cc b/chrome/browser/chromeos/login/login_utils_browsertest.cc
index 3121d7d4a127910b0a4ad752f63ac39f3d47f0ac..ada67d87a29ef2180e00e1982cddf933d4fb303d 100644
--- a/chrome/browser/chromeos/login/login_utils_browsertest.cc
+++ b/chrome/browser/chromeos/login/login_utils_browsertest.cc
@@ -84,19 +84,10 @@ using ::testing::SetArgPointee;
 using ::testing::_;
 using content::BrowserThread;
 
-const char kTrue[] = "true";
-const char kFalse[] = "false";
 const char kDomain[] = "domain.com";
 const char kUsername[] = "user@domain.com";
-const char kMode[] = "enterprise";
 const char kDeviceId[] = "100200300";
 const char kUsernameOtherDomain[] = "user@other.com";
-const char kAttributeOwned[] = "enterprise.owned";
-const char kAttributeOwner[] = "enterprise.user";
-const char kAttributeConsumerKiosk[] = "consumer.app_kiosk_enabled";
-const char kAttrEnterpriseDomain[] = "enterprise.domain";
-const char kAttrEnterpriseMode[] = "enterprise.mode";
-const char kAttrEnterpriseDeviceId[] = "enterprise.device_id";
 
 const char kOAuthTokenCookie[] = "oauth_token=1234";