Revert of Disable DomDistillerViewerSourceBrowserTest.NoWebUIBindings…

…Article{Exists,NotFound} tests. (patchset chromium#2 id:20001 of https://codereview.chromium.org/1911733002/ )

Reason for revert:
A change landed that fixes the reason these became flaky (https://codereview.chromium.org/1920563002/).

Original issue's description:
> Disable DomDistillerViewerSourceBrowserTest.NoWebUIBindingsArticle{Exists,NotFound} tests.
>
> Starting with https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29/builds/53656
> these tests became flaky:
> DomDistillerViewerSourceBrowserTest.NoWebUIBindingsArticleExists
> DomDistillerViewerSourceBrowserTest.NoWebUIBindingsArticleNotFound
>
> BUG=605432
> TBR=nyquist@chromium.org
>
> Committed: https://crrev.com/620c8a6cf23eebb0497ff4e64216fdaa8818433a
> Cr-Commit-Position: refs/heads/master@{#388722}

TBR=nyquist@chromium.org,kjellander@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=605432

Review-Url: https://codereview.chromium.org/1969993002
Cr-Commit-Position: refs/heads/master@{#393136}

chrome/browser/dom_distiller/dom_distiller_viewer_source_browsertest.cc

@@ -169,14 +169,8 @@ MockDistillerFactory* DomDistillerViewerSourceBrowserTest::distiller_factory_ =
 
 // The DomDistillerViewerSource renders untrusted content, so ensure no bindings
 // are enabled when the article exists in the database.
-// Flaky on Linux Debug, see http://crbug.com/605432.
-#if defined(OS_LINUX) && !defined(NDEBUG)
-#define MAYBE_NoWebUIBindingsArticleExists DISABLED_NoWebUIBindingsArticleExists
-#else
-#define MAYBE_NoWebUIBindingsArticleExists NoWebUIBindingsArticleExists
-#endif
 IN_PROC_BROWSER_TEST_F(DomDistillerViewerSourceBrowserTest,
-                       MAYBE_NoWebUIBindingsArticleExists) {
+                       NoWebUIBindingsArticleExists) {
   // Ensure there is one item in the database, which will trigger distillation.
   const ArticleEntry entry = CreateEntry("DISTILLED", "http://example.com/1");
   AddEntry(entry, database_model_);
@@ -189,14 +183,8 @@ IN_PROC_BROWSER_TEST_F(DomDistillerViewerSourceBrowserTest,
 
 // The DomDistillerViewerSource renders untrusted content, so ensure no bindings
 // are enabled when the article is not found.
-// Flaky on Linux Debug, see http://crbug.com/605432.
-#if defined(OS_LINUX) && !defined(NDEBUG)
-#define MAYBE_NoWebUIBindingsArticleNotFound DISABLED_NoWebUIBindingsArticleNotFound
-#else
-#define MAYBE_NoWebUIBindingsArticleNotFound NoWebUIBindingsArticleNotFound
-#endif
 IN_PROC_BROWSER_TEST_F(DomDistillerViewerSourceBrowserTest,
-                       MAYBE_NoWebUIBindingsArticleNotFound) {
+                       NoWebUIBindingsArticleNotFound) {
   // The article does not exist, so assume no distillation will happen.
   expect_distillation_ = false;
   expect_distiller_page_ = false;