Ensure MemoryInstrumentationTest::Navigate works correctly.

The navigation performed in the MemoryInstrumentationTest::Navigate
method is using a non-existing file, which means the navigation does
not succeed. This CL fixes the code to use a file that exists and
to check the navigation is actually successful.

Bug: 838161
Change-Id: Icf0715f687a1cdf763b47e3bd3155321e761af96
Reviewed-on: https://chromium-review.googlesource.com/1037637Reviewed-by: Siddhartha S <ssid@chromium.org>
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555146}

content/browser/tracing/memory_instrumentation_browsertest.cc

@@ -27,7 +27,7 @@ namespace content {
 class MemoryInstrumentationTest : public ContentBrowserTest {
  protected:
   void Navigate(Shell* shell) {
-    NavigateToURL(shell, GetTestUrl("", "title.html"));
+    EXPECT_TRUE(NavigateToURL(shell, GetTestUrl("", "title1.html")));
   }
 };
 
@@ -72,7 +72,7 @@ std::unique_ptr<GlobalMemoryDump> DoGlobalDump() {
     defined(THREAD_SANITIZER)
 #define MAYBE_PrivateFootprintComputation DISABLED_PrivateFootprintComputation
 #else
-#define MAYBE_PrivateFootprintComputation PrivateFootprintComputatio
+#define MAYBE_PrivateFootprintComputation PrivateFootprintComputation
 #endif
 
 // Despite the location, this test is not tracing related.