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

chrome/browser/extensions/extension_browsertest.cc

Index: chrome/browser/extensions/extension_browsertest.cc
diff --git a/chrome/browser/extensions/extension_browsertest.cc b/chrome/browser/extensions/extension_browsertest.cc
index 1aa8bd631886c3ec4ba8b382353c62064ba22c4a..b425a4437800b8419780f6e871c8cc0f90aaf0e8 100644
--- a/chrome/browser/extensions/extension_browsertest.cc
+++ b/chrome/browser/extensions/extension_browsertest.cc
@@ -18,6 +18,7 @@
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_scheduler/post_task.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/browsertest_util.h"
 #include "chrome/browser/extensions/chrome_test_extension_loader.h"
@@ -149,6 +150,7 @@ Profile* ExtensionBrowserTest::profile() {
 const Extension* ExtensionBrowserTest::GetExtensionByPath(
     const extensions::ExtensionSet& extensions,
     const base::FilePath& path) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::FilePath extension_path = base::MakeAbsoluteFilePath(path);
   EXPECT_TRUE(!extension_path.empty());
   for (const scoped_refptr<const Extension>& extension : extensions) {
@@ -252,6 +254,7 @@ const Extension* ExtensionBrowserTest::LoadExtensionAsComponentWithManifest(
       profile())->extension_service();
   ExtensionRegistry* registry = ExtensionRegistry::Get(profile());
 
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   std::string manifest;
   if (!base::ReadFileToString(path.Append(manifest_relative_path), &manifest)) {
     return NULL;
@@ -292,6 +295,7 @@ const Extension* ExtensionBrowserTest::LoadAndLaunchApp(
 
 base::FilePath ExtensionBrowserTest::PackExtension(
     const base::FilePath& dir_path) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::FilePath crx_path = temp_dir_.GetPath().AppendASCII("temp.crx");
   if (!base::DeleteFile(crx_path, false)) {
     ADD_FAILURE() << "Failed to delete crx: " << crx_path.value();
@@ -320,6 +324,7 @@ base::FilePath ExtensionBrowserTest::PackExtensionWithOptions(
     const base::FilePath& crx_path,
     const base::FilePath& pem_path,
     const base::FilePath& pem_out_path) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   if (!base::PathExists(dir_path)) {
     ADD_FAILURE() << "Extension dir not found: " << dir_path.value();
     return base::FilePath();