[tracing] Switch to new heap dump format.

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 571774a10ca2224e469e447902be2e0b5618953b..110fa8d58a1a6e45acabf7e35a1d29ec4290a2bd 100644
--- a/base/trace_event/process_memory_dump_unittest.cc
+++ b/base/trace_event/process_memory_dump_unittest.cc
@@ -24,10 +24,12 @@ const char* const kTestDumpNameWhitelist[] = {
     "Whitelisted/TestName", "Whitelisted/TestName_0x?",
     "Whitelisted/0x?/TestName", nullptr};
 
+#if 0
 TracedValue* GetHeapDump(const ProcessMemoryDump& pmd, const char* name) {
   auto it = pmd.heap_dumps().find(name);
   return it == pmd.heap_dumps().end() ? nullptr : it->second.get();
 }
+#endif
 
 }  // namespace
 
@@ -88,6 +90,7 @@ TEST(ProcessMemoryDumpTest, Clear) {
   pmd1.reset();
 }
 
+#if 0
 TEST(ProcessMemoryDumpTest, TakeAllDumpsFrom) {
   std::unique_ptr<TracedValue> traced_value(new TracedValue);
   hash_map<AllocationContext, AllocationMetrics> metrics_by_context;
@@ -163,6 +166,7 @@ TEST(ProcessMemoryDumpTest, TakeAllDumpsFrom) {
 
   pmd1.reset();
 }
+#endif
 
 TEST(ProcessMemoryDumpTest, Suballocations) {
   std::unique_ptr<ProcessMemoryDump> pmd(