Get headless_shell building on Windows.

headless/lib/browser/headless_content_browser_client.cc

Index: headless/lib/browser/headless_content_browser_client.cc
diff --git a/headless/lib/browser/headless_content_browser_client.cc b/headless/lib/browser/headless_content_browser_client.cc
index a6db422c454cbdf3c5cb4d062d9dafee2bec41d6..731d35f9882a261e0495dd2c6353d11181aa955f 100644
--- a/headless/lib/browser/headless_content_browser_client.cc
+++ b/headless/lib/browser/headless_content_browser_client.cc
@@ -170,6 +170,7 @@ void HeadlessContentBrowserClient::GetQuotaSettings(
       callback);
 }
 
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
 void HeadlessContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
     const base::CommandLine& command_line,
     int child_process_id,
@@ -180,6 +181,7 @@ void HeadlessContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
     mappings->Share(kCrashDumpSignal, crash_signal_fd);
 #endif  // defined(HEADLESS_USE_BREAKPAD)
 }
+#endif

[Sami, 2017/02/20 16:50:23]

nit: Please add a comment at the end of long ifdef blocks like these:

#endif  // defined(OS_POSIX) && !defined(OS_MACOSX)

 
 void HeadlessContentBrowserClient::AppendExtraCommandLineSwitches(
     base::CommandLine* command_line,