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

ui/aura/gestures/gesture_recognizer_unittest.cc

 // Copyright (c) 2012 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/command_line.h"
 #include "base/memory/scoped_vector.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/timer/timer.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 652 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(GestureRecognizerTest);
 };
 
 class GestureRecognizerWithSwitchTest : public GestureRecognizerTest {
  public:
   GestureRecognizerWithSwitchTest() {}
 
   void SetUp() override {
     GestureRecognizerTest::SetUp();
-    CommandLine::ForCurrentProcess()->AppendSwitch(
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kCompensateForUnstablePinchZoom);
     ui::GestureConfiguration::GetInstance()->set_min_pinch_update_span_delta(5);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GestureRecognizerWithSwitchTest);
 };
 
 // Check that appropriate touch events generate tap gesture events.
 TEST_F(GestureRecognizerTest, GestureEventTap) {
@@ skipping 3743 matching lines @@
   // The synchronous ack is stuck behind the pending touch move.
   EXPECT_0_EVENTS(delegate->events());
 
   delegate->ReceivedAck();
   EXPECT_2_EVENTS(delegate->events(), ui::ET_GESTURE_SCROLL_UPDATE,
                   ui::ET_GESTURE_SCROLL_UPDATE);
 }
 
 }  // namespace test
 }  // namespace aura