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

content/public/test/test_renderer_host.cc

Index: content/public/test/test_renderer_host.cc
diff --git a/content/public/test/test_renderer_host.cc b/content/public/test/test_renderer_host.cc
index d8faf26f5a352b0db421e07f853891b7b82cbcb0..fd9d35601597825d00feabc1001d3379ba39e762 100644
--- a/content/public/test/test_renderer_host.cc
+++ b/content/public/test/test_renderer_host.cc
@@ -197,14 +197,14 @@ void RenderViewHostTestHarness::SetUp() {
 
   SetContents(CreateTestWebContents());
 
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableBrowserSideNavigation)) {
     BrowserSideNavigationSetUp();
   }
 }
 
 void RenderViewHostTestHarness::TearDown() {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableBrowserSideNavigation)) {
     BrowserSideNavigationTearDown();
   }