Fix integration tests in src/chrome and src/extensions so that we can turn on IO thread checks wi...

base/test/multiprocess_test.cc

Index: base/test/multiprocess_test.cc
diff --git a/base/test/multiprocess_test.cc b/base/test/multiprocess_test.cc
index 9da2433476ed2d2db46e7a755c0ef64a48916bbd..d45e3a8b4b38bcff47429952b24b01f84984e0b8 100644
--- a/base/test/multiprocess_test.cc
+++ b/base/test/multiprocess_test.cc
@@ -8,6 +8,7 @@
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 
 namespace base {
@@ -44,6 +45,7 @@ bool TerminateMultiProcessTestChild(const Process& process,
 #endif  // !defined(OS_ANDROID)
 
 CommandLine GetMultiProcessTestChildBaseCommandLine() {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   CommandLine cmd_line = *CommandLine::ForCurrentProcess();
   cmd_line.SetProgram(MakeAbsoluteFilePath(cmd_line.GetProgram()));
   return cmd_line;