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

chrome/browser/metrics/thread_watcher.cc

Index: chrome/browser/metrics/thread_watcher.cc
diff --git a/chrome/browser/metrics/thread_watcher.cc b/chrome/browser/metrics/thread_watcher.cc
index 1bdd544b6500005948c969fb0ca9ad554ea7b530..70846729e9ffd4c5573e51cd0dd1d848869e8655 100644
--- a/chrome/browser/metrics/thread_watcher.cc
+++ b/chrome/browser/metrics/thread_watcher.cc
@@ -345,7 +345,8 @@ ThreadWatcherList::CrashDataThresholds::CrashDataThresholds()
 }
 
 // static
-void ThreadWatcherList::StartWatchingAll(const CommandLine& command_line) {
+void ThreadWatcherList::StartWatchingAll(
+    const base::CommandLine& command_line) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   uint32 unresponsive_threshold;
   CrashOnHangThreadMap crash_on_hang_threads;
@@ -441,7 +442,7 @@ ThreadWatcherList::~ThreadWatcherList() {
 
 // static
 void ThreadWatcherList::ParseCommandLine(
-    const CommandLine& command_line,
+    const base::CommandLine& command_line,
     uint32* unresponsive_threshold,
     CrashOnHangThreadMap* crash_on_hang_threads) {
   // Initialize |unresponsive_threshold| to a default value.