BlobUrlBrowserTest: Add a test exercising blob: URLs from file:// documents.

content/public/test/browser_test_base.h

Index: content/public/test/browser_test_base.h
diff --git a/content/public/test/browser_test_base.h b/content/public/test/browser_test_base.h
index fa14d40fcce454ad576c12492533e74964668c2c..f5ef43b933aaa4817c4f84ace46f0fecf360bd49 100644
--- a/content/public/test/browser_test_base.h
+++ b/content/public/test/browser_test_base.h
@@ -121,6 +121,9 @@ class BrowserTestBase : public testing::Test {
   // instead.
   void UseSoftwareCompositing();
 
+  // Call this before SetUp to run without kAllowFileAccessFromFiles.
+  void RevokeFileAccessFromFiles();
+
   // Returns true if the test will be using GL acceleration via OSMesa.
   bool UsingOSMesa() const;
 
@@ -146,6 +149,9 @@ class BrowserTestBase : public testing::Test {
   // When true, do compositing with the software backend instead of using GL.
   bool use_software_compositing_;
 
+  // Controls the presence of the kAllowFileAccessFromFiles command line switch.
+  bool allow_file_access_from_files_;
+
   // Whether SetUp was called. This value is checked in the destructor of this
   // class to ensure that SetUp was called. If it's not called, the test will
   // not run and report a false positive result.