Replace the asan_coverage GYP flag with sanitizer_coverage which is to be used with other sanitizer…

content/zygote/zygote_linux.cc

Index: content/zygote/zygote_linux.cc
diff --git a/content/zygote/zygote_linux.cc b/content/zygote/zygote_linux.cc
index 7e4cee543a2e6fd0720040b8408697cae71cd906..42dd5d8457f9a0bda85d79ee0b681f9cfc7629ff 100644
--- a/content/zygote/zygote_linux.cc
+++ b/content/zygote/zygote_linux.cc
@@ -37,10 +37,6 @@
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_switches.h"
 
-#if defined(ADDRESS_SANITIZER)
-#include <sanitizer/asan_interface.h>
-#endif
-
 // See http://code.google.com/p/chromium/wiki/LinuxZygote
 
 namespace content {
@@ -165,8 +161,9 @@ bool Zygote::HandleRequestFromBrowser(int fd) {
          it < extra_fds_.end(); ++it) {
       PCHECK(0 == IGNORE_EINTR(close(*it)));
     }
-#if !defined(ADDRESS_SANITIZER)
-    // TODO(earthdok): add watchdog thread before using this in non-ASAN builds.
+#if !defined(SANITIZER_COVERAGE)
+    // TODO(earthdok): add watchdog thread before using this in builds not
+    // using sanitizer coverage.
     CHECK(extra_children_.empty());
 #endif
     for (std::vector<base::ProcessHandle>::iterator it =