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

content/shell/common/shell_content_client.cc

Index: content/shell/common/shell_content_client.cc
diff --git a/content/shell/common/shell_content_client.cc b/content/shell/common/shell_content_client.cc
index e951aed999bb032a455e8e501804207420875de2..db521d47712e1f29755b6a1ef9381e6d65d8a49e 100644
--- a/content/shell/common/shell_content_client.cc
+++ b/content/shell/common/shell_content_client.cc
@@ -20,7 +20,7 @@ namespace content {
 
 std::string GetShellUserAgent() {
   std::string product = "Chrome/" CONTENT_SHELL_VERSION;
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kUseMobileUserAgent))
     product += " Mobile";
   return BuildUserAgentFromProduct(product);
@@ -34,7 +34,8 @@ std::string ShellContentClient::GetUserAgent() const {
 }
 
 base::string16 ShellContentClient::GetLocalizedString(int message_id) const {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree)) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDumpRenderTree)) {
     switch (message_id) {
       case IDS_FORM_OTHER_DATE_LABEL:
         return base::ASCIIToUTF16("<<OtherDateLabel>>");
@@ -60,7 +61,8 @@ base::string16 ShellContentClient::GetLocalizedString(int message_id) const {
 base::StringPiece ShellContentClient::GetDataResource(
     int resource_id,
     ui::ScaleFactor scale_factor) const {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree)) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDumpRenderTree)) {
     switch (resource_id) {
       case IDR_BROKENIMAGE:
 #if defined(OS_MACOSX)