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

chrome/browser/task_manager/providers/web_contents/tab_contents_tag_browsertest.cc

Index: chrome/browser/task_manager/providers/web_contents/tab_contents_tag_browsertest.cc
diff --git a/chrome/browser/task_manager/providers/web_contents/tab_contents_tag_browsertest.cc b/chrome/browser/task_manager/providers/web_contents/tab_contents_tag_browsertest.cc
index 08e35d449bf7b5d51a43d392cb0033a805b061dd..060453c67944168a8cf69a2077be78ecbc1d4e2f 100644
--- a/chrome/browser/task_manager/providers/web_contents/tab_contents_tag_browsertest.cc
+++ b/chrome/browser/task_manager/providers/web_contents/tab_contents_tag_browsertest.cc
@@ -7,6 +7,7 @@
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/task_manager/mock_web_contents_task_manager.h"
 #include "chrome/browser/task_manager/providers/web_contents/web_contents_tags_manager.h"
 #include "chrome/browser/ui/browser.h"
@@ -294,8 +295,12 @@ IN_PROC_BROWSER_TEST_F(TabContentsTagTest, NavigateToPageNoFavicon) {
   base::FilePath test_dir;
   PathService::Get(chrome::DIR_TEST_DATA, &test_dir);
   std::string favicon_string;
-  base::ReadFileToString(
-      test_dir.AppendASCII("favicon").AppendASCII("icon.png"), &favicon_string);
+  {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    base::ReadFileToString(
+        test_dir.AppendASCII("favicon").AppendASCII("icon.png"),
+        &favicon_string);
+  }
   SkBitmap favicon_bitmap;
   gfx::PNGCodec::Decode(
       reinterpret_cast<const unsigned char*>(favicon_string.data()),