Make callers of CommandLine use it via the base:: namespace.

chrome/browser/extensions/extension_assets_manager_chromeos.cc

Index: chrome/browser/extensions/extension_assets_manager_chromeos.cc
diff --git a/chrome/browser/extensions/extension_assets_manager_chromeos.cc b/chrome/browser/extensions/extension_assets_manager_chromeos.cc
index 46a9a11dd9285301ca44ad4630699ee5eec90802..f4efa6e67c829b475fc49d0930520dd5f04657cb 100644
--- a/chrome/browser/extensions/extension_assets_manager_chromeos.cc
+++ b/chrome/browser/extensions/extension_assets_manager_chromeos.cc
@@ -253,7 +253,7 @@ base::SequencedTaskRunner* ExtensionAssetsManagerChromeOS::GetFileTaskRunner(
 bool ExtensionAssetsManagerChromeOS::CanShareAssets(
     const Extension* extension,
     const base::FilePath& unpacked_extension_root) {
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
           chromeos::switches::kEnableExtensionAssetsSharing)) {
     return false;
   }