Prepare for -Wall for third-party code, -Wextra for chromium_code

components/crash/content/app/breakpad_linux.cc

Index: components/crash/content/app/breakpad_linux.cc
diff --git a/components/crash/content/app/breakpad_linux.cc b/components/crash/content/app/breakpad_linux.cc
index 077007919c2bb2afde6b2a7196bd2052036df0c1..fa9f620e3f7e2e3d8cbebd0e5736aac939807882 100644
--- a/components/crash/content/app/breakpad_linux.cc
+++ b/components/crash/content/app/breakpad_linux.cc
@@ -76,7 +76,7 @@
 // where we either a) know the call cannot fail, or b) there is nothing we
 // can do when a call fails, we mark the return code as ignored. This avoids
 // spurious compiler warnings.
-#define IGNORE_RET(x) do { if (x); } while (0)
+#define IGNORE_RET(x) ignore_result(x)
 
 using crash_reporter::GetCrashReporterClient;
 using google_breakpad::ExceptionHandler;