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

chrome/browser/extensions/api/tab_capture/tab_capture_performancetest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/trace_event_analyzer.h"
 #include "base/win/windows_version.h"
 #include "chrome/browser/extensions/extension_apitest.h"
@@ skipping 44 matching lines @@
     : public ExtensionApiTest,
       public testing::WithParamInterface<int> {
  public:
   TabCapturePerformanceTest() {}
 
   bool HasFlag(TestFlags flag) const {
     return (GetParam() & flag) == flag;
   }
 
   bool IsGpuAvailable() const {
-    return CommandLine::ForCurrentProcess()->HasSwitch("enable-gpu");
+    return base::CommandLine::ForCurrentProcess()->HasSwitch("enable-gpu");
   }
 
   std::string ScalingMethod() const {
     switch (GetParam() & kScaleQualityMask) {
       case kScaleQualityFast:
         return "fast";
       case kScaleQualityGood:
         return "good";
       case kScaleQualityBest:
         return "best";
@@ skipping 17 matching lines @@
     if (HasFlag(kSmallWindow))
       suffix += "_small";
     return suffix;
   }
 
   void SetUp() override {
     EnablePixelOutput();
     ExtensionApiTest::SetUp();
   }
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     if (!ScalingMethod().empty()) {
       command_line->AppendSwitchASCII(switches::kTabCaptureUpscaleQuality,
                                       ScalingMethod());
       command_line->AppendSwitchASCII(switches::kTabCaptureDownscaleQuality,
                                       ScalingMethod());
     }
 
     // Some of the tests may launch http requests through JSON or AJAX
     // which causes a security error (cross domain request) when the page
     // is loaded from the local file system ( file:// ). The following switch
@@ skipping 133 matching lines @@
     TabCapturePerformanceTest,
     testing::Values(
         kScalingTestBase | kScaleQualityFast,
         kScalingTestBase | kScaleQualityGood,
         kScalingTestBase | kScaleQualityBest,
         kScalingTestBase | kScaleQualityFast | kSmallWindow,
         kScalingTestBase | kScaleQualityGood | kSmallWindow,
         kScalingTestBase | kScaleQualityBest | kSmallWindow));
 
 #endif  // USE_AURA