Increase kShutdownDetectorThreadStackSize to avoid tcmalloc stack overflow.

chrome/browser/chrome_browser_main_posix.cc

Index: chrome/browser/chrome_browser_main_posix.cc
diff --git a/chrome/browser/chrome_browser_main_posix.cc b/chrome/browser/chrome_browser_main_posix.cc
index e73e492346b2717372c9adc14fe4d7cada27825a..4e5bcfdf4b42de33ea4fe91a67005f14d105c70e 100644
--- a/chrome/browser/chrome_browser_main_posix.cc
+++ b/chrome/browser/chrome_browser_main_posix.cc
@@ -314,7 +314,7 @@ void ChromeBrowserMainPartsPosix::PostMainMessageLoopStart() {
     g_shutdown_pipe_read_fd = pipefd[0];
     g_shutdown_pipe_write_fd = pipefd[1];
 #if !defined(ADDRESS_SANITIZER) && !defined(KEEP_SHADOW_STACKS)
-    const size_t kShutdownDetectorThreadStackSize = PTHREAD_STACK_MIN;
+    const size_t kShutdownDetectorThreadStackSize = PTHREAD_STACK_MIN * 2;
 #else
     // ASan instrumentation and -finstrument-functions (used for keeping the
     // shadow stacks) bloat the stack frames, so we need to increase the stack