Fix ProcessMemoryMetricsEmitterTest

Do not check for uptime to be less than 10. Process could be running
longer in the test. This does not fix the failure due to missing uptime
value.

BUG=731466

Change-Id: I0b176da810dd8f3bc90ad4b94386bc46e68fa1e7
Reviewed-on: https://chromium-review.googlesource.com/c/1338954Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630104}

chrome/browser/metrics/process_memory_metrics_emitter_browsertest.cc

@@ -329,7 +329,7 @@ class ProcessMemoryMetricsEmitterTest
     const int64_t* value = ukm::TestUkmRecorder::GetEntryMetric(entry, name);
     ASSERT_TRUE(value) << name;
     EXPECT_GE(*value, 0) << name;
-    EXPECT_LE(*value, 10) << name;
+    EXPECT_LE(*value, 300) << name;
   }
 
   void CheckAllUkmEntries(size_t entry_count = 1u) {