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

chrome/browser/printing/print_dialog_cloud.cc

Index: chrome/browser/printing/print_dialog_cloud.cc
diff --git a/chrome/browser/printing/print_dialog_cloud.cc b/chrome/browser/printing/print_dialog_cloud.cc
index fa26a10f83ab8f5c301292b82e14d39fd72accd4..1fbfbdd8048cb399794c3a6f9bf8d3680f7502dc 100644
--- a/chrome/browser/printing/print_dialog_cloud.cc
+++ b/chrome/browser/printing/print_dialog_cloud.cc
@@ -196,13 +196,13 @@ bool GetPageSetupParameters(const std::string& json,
   return result;
 }
 
-base::string16 GetSwitchValueString16(const CommandLine& command_line,
+base::string16 GetSwitchValueString16(const base::CommandLine& command_line,
                                       const char* switchName) {
 #if defined(OS_WIN)
   return command_line.GetSwitchValueNative(switchName);
 #elif defined(OS_POSIX)
   // POSIX Command line string types are different.
-  CommandLine::StringType native_switch_val;
+  base::CommandLine::StringType native_switch_val;
   native_switch_val = command_line.GetSwitchValueASCII(switchName);
   // Convert the ASCII string to UTF16 to prepare to pass.
   return base::ASCIIToUTF16(native_switch_val);
@@ -748,7 +748,7 @@ void CreatePrintDialogForBytes(content::BrowserContext* browser_context,
 }
 
 bool CreatePrintDialogFromCommandLine(Profile* profile,
-                                      const CommandLine& command_line) {
+                                      const base::CommandLine& command_line) {
   DCHECK(command_line.HasSwitch(switches::kCloudPrintFile));
   if (!command_line.GetSwitchValuePath(switches::kCloudPrintFile).empty()) {
     base::FilePath cloud_print_file;