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

tools/ipc_fuzzer/mutate/generate.cc

Index: tools/ipc_fuzzer/mutate/generate.cc
diff --git a/tools/ipc_fuzzer/mutate/generate.cc b/tools/ipc_fuzzer/mutate/generate.cc
index 8d11280b8a1c3c662f549cf585c47edcc34e3c8b..c3bb18af1e68b91b094d2cb86502f72447870ebf 100644
--- a/tools/ipc_fuzzer/mutate/generate.cc
+++ b/tools/ipc_fuzzer/mutate/generate.cc
@@ -1285,9 +1285,9 @@ static const char kCountSwitch[] = "count";
 static const char kHelpSwitch[] = "help";
 
 int GenerateMain(int argc, char** argv) {
-  CommandLine::Init(argc, argv);
-  CommandLine* cmd = CommandLine::ForCurrentProcess();
-  CommandLine::StringVector args = cmd->GetArgs();
+  base::CommandLine::Init(argc, argv);
+  base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
+  base::CommandLine::StringVector args = cmd->GetArgs();
 
   if (args.size() != 1 || cmd->HasSwitch(kHelpSwitch)) {
     std::cerr << "Usage: ipc_fuzzer_generate [--help] [--count=n] outfile\n";