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

Covers courgette/, dbus/, device/, extensions/, gin/, google_apis/, and gpu/.

BUG=422426
TEST=none
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Review URL: https://codereview.chromium.org/819193002

Cr-Commit-Position: refs/heads/master@{#309490}
diff --git a/dbus/test_server.cc b/dbus/test_server.cc
index 88f751f..7e4722d 100644
--- a/dbus/test_server.cc
+++ b/dbus/test_server.cc
@@ -10,7 +10,7 @@
 
 int main(int argc, char** argv) {
   base::AtExitManager exit_manager;
-  CommandLine::Init(argc, argv);
+  base::CommandLine::Init(argc, argv);
   TestTimeouts::Initialize();
 
   base::Thread* dbus_thread = new base::Thread("D-Bus Thread");