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

chrome/test/ppapi/ppapi_browsertest.cc

Index: chrome/test/ppapi/ppapi_browsertest.cc
diff --git a/chrome/test/ppapi/ppapi_browsertest.cc b/chrome/test/ppapi/ppapi_browsertest.cc
index bcf0a4a6f72c445d3730ad8db7ab06847eac2e50..5eb357535ef5feefe611e53bcb333e4b89ca72e3 100644
--- a/chrome/test/ppapi/ppapi_browsertest.cc
+++ b/chrome/test/ppapi/ppapi_browsertest.cc
@@ -7,6 +7,7 @@
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/test/test_timeouts.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
@@ -1259,7 +1260,10 @@ class PackagedAppTest : public ExtensionBrowserTest {
 
   void LaunchTestingApp(const std::string& extension_dirname) {
     base::FilePath data_dir;
-    ASSERT_TRUE(PathService::Get(chrome::DIR_GEN_TEST_DATA, &data_dir));
+    {
+      base::ThreadRestrictions::ScopedAllowIO allow_io;
+      ASSERT_TRUE(PathService::Get(chrome::DIR_GEN_TEST_DATA, &data_dir));
+    }
     base::FilePath app_dir = data_dir.AppendASCII("ppapi")
                                      .AppendASCII("tests")
                                      .AppendASCII("extensions")