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

chrome/browser/extensions/api/page_capture/page_capture_apitest.cc

Index: chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
diff --git a/chrome/browser/extensions/api/page_capture/page_capture_apitest.cc b/chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
index 73b03023fc9ec81a2dc0abf93a2e128d68eea7bd..295c3031fe7649792ae746d7debcd9a9c44275fa 100644
--- a/chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
+++ b/chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
@@ -14,7 +14,7 @@ using extensions::PageCaptureSaveAsMHTMLFunction;
 
 class ExtensionPageCaptureApiTest : public ExtensionApiTest {
  public:
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII(switches::kJavaScriptFlags, "--expose-gc");
   }