[tracing] Set whitelist values for dump provider supporting background mode

base/trace_event/process_memory_dump_unittest.cc

Index: base/trace_event/process_memory_dump_unittest.cc
diff --git a/base/trace_event/process_memory_dump_unittest.cc b/base/trace_event/process_memory_dump_unittest.cc
index e31aeaa2d6b7fd9c5ef7a9f21d53ca76c8719361..2e4c40f4482ae4b92dbd1d6de2a958ec0dc21279 100644
--- a/base/trace_event/process_memory_dump_unittest.cc
+++ b/base/trace_event/process_memory_dump_unittest.cc
@@ -270,9 +270,9 @@ TEST(ProcessMemoryDumpTest, BackgroundModeTest) {
   EXPECT_NE(black_hole_mad,
             pmd->CreateAllocatorDump("Whitelisted/TestName0xA1b2"));
   EXPECT_NE(black_hole_mad,
-            pmd->CreateAllocatorDump("Whitelisted/TestName_123"));
+            pmd->CreateAllocatorDump("Whitelisted/TestName123"));
   EXPECT_NE(black_hole_mad,
-            pmd->CreateAllocatorDump("Whitelisted_12/0xaB/TestName"));
+            pmd->CreateAllocatorDump("Whitelisted12/0xaB/TestName"));
 
   // GetAllocatorDump is consistent.
   EXPECT_EQ(black_hole_mad, pmd->GetAllocatorDump("NotWhitelisted/TestName"));