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

Covers chrome/app* and chrome/browser/* through e.

BUG=422426
TEST=none
[email protected]

Review URL: https://codereview.chromium.org/819133004

Cr-Commit-Position: refs/heads/master@{#309476}
diff --git a/chrome/browser/extensions/process_management_browsertest.cc b/chrome/browser/extensions/process_management_browsertest.cc
index 97c5b25..fc1532e 100644
--- a/chrome/browser/extensions/process_management_browsertest.cc
+++ b/chrome/browser/extensions/process_management_browsertest.cc
@@ -29,7 +29,7 @@
 class ProcessManagementTest : public ExtensionBrowserTest {
  private:
   // This is needed for testing isolated apps, which are still experimental.
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionBrowserTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(
         extensions::switches::kEnableExperimentalExtensionApis);