chromeos: Remove blanket file access logic from chromeos chrome on Linux

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index 84a4eb8a15a787786144526472125245c235c91f..6c04bc1c92e505d73d5e8ebf74f9c949dc2b45af 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -450,9 +450,9 @@ bool ChromeNetworkDelegate::OnCanSetCookie(const net::URLRequest& request,
 bool ChromeNetworkDelegate::OnCanAccessFile(const net::URLRequest& request,
                                             const base::FilePath& path) const {
 #if defined(OS_CHROMEOS)
-  // If we're running Chrome for ChromeOS on Linux, we want to allow file
-  // access. This is checked here to make IsAccessAllowed() unit-testable.
-  if (!base::SysInfo::IsRunningOnChromeOS())
+  // browser_tests and interactive_ui_tests rely on the ability to open any
+  // files via file: scheme.
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kTestType))
     return true;
 #endif