Add run-time CHECK to smoke-test allocator overrides

content/app/content_main_runner.cc

Index: content/app/content_main_runner.cc
diff --git a/content/app/content_main_runner.cc b/content/app/content_main_runner.cc
index 3b5f88ad7b58b76de4d0aed66959c37b6a70758f..037c79bd512ed948ee71b560b89076cdbf2300fb 100644
--- a/content/app/content_main_runner.cc
+++ b/content/app/content_main_runner.cc
@@ -10,6 +10,7 @@
 #include <string>
 #include <utility>
 
+#include "base/allocator/allocator_check.h"
 #include "base/allocator/allocator_extension.h"
 #include "base/at_exit.h"
 #include "base/command_line.h"
@@ -654,6 +655,12 @@ class ContentMainRunnerImpl : public ContentMainRunner {
     base::win::SetupCRT(command_line);
 #endif
 
+    // If we are on a platform where the default allocator is overridden (shim
+    // layer on windows, tcmalloc on Linux Desktop) smoke-tests that the
+    // overriding logic is working correctly. If not causes a hard crash, as its
+    // unexpected absence has security implications.
+    CHECK(base::allocator::IsAllocatorInitialized());
+
 #if defined(OS_POSIX)
     if (!process_type.empty()) {
       // When you hit Ctrl-C in a terminal running the browser