Check for learn-more-link before clicking details

The "learn more" link has moved to the main content instead of the
details. Tests should check for it before clicking the details, since
mobile layouts will hide the main content after "details" is clicked.

BUG=674732

Review-Url: https://codereview.chromium.org/2845363003
Cr-Commit-Position: refs/heads/master@{#468073}

chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc

@@ -610,8 +610,8 @@ class SafeBrowsingBlockingPageBrowserTest
     EXPECT_EQ(HIDDEN, GetVisibility("extended-reporting-opt-in"));
     EXPECT_EQ(HIDDEN, GetVisibility("opt-in-checkbox"));
     EXPECT_EQ(HIDDEN, GetVisibility("proceed-link"));
-    EXPECT_TRUE(Click("details-button"));
     EXPECT_EQ(VISIBLE, GetVisibility("learn-more-link"));
+    EXPECT_TRUE(Click("details-button"));
     EXPECT_EQ(VISIBLE, GetVisibility("proceed-link"));
 
     EXPECT_TRUE(ClickAndWaitForDetach("primary-button"));