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

ui/gfx/display.cc

Index: ui/gfx/display.cc
diff --git a/ui/gfx/display.cc b/ui/gfx/display.cc
index 8f0140872f19cb424ce2a4ab08b02c923e6f0b4c..c51103f70e5cc793435c99a5dad288804cdf95ba 100644
--- a/ui/gfx/display.cc
+++ b/ui/gfx/display.cc
@@ -20,15 +20,16 @@ namespace gfx {
 namespace {
 
 bool HasForceDeviceScaleFactorImpl() {
-  return CommandLine::ForCurrentProcess()->HasSwitch(
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kForceDeviceScaleFactor);
 }
 
 float GetForcedDeviceScaleFactorImpl() {
   double scale_in_double = 1.0;
   if (HasForceDeviceScaleFactorImpl()) {
-    std::string value = CommandLine::ForCurrentProcess()->
-        GetSwitchValueASCII(switches::kForceDeviceScaleFactor);
+    std::string value =
+        base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+            switches::kForceDeviceScaleFactor);
     if (!base::StringToDouble(value, &scale_in_double))
       LOG(ERROR) << "Failed to parse the default device scale factor:" << value;
   }