Add missing content namespace to the android library loader.

content/browser/android/library_loader_hooks.cc

Index: content/browser/android/library_loader_hooks.cc
diff --git a/content/browser/android/library_loader_hooks.cc b/content/browser/android/library_loader_hooks.cc
index 17ebbd433f7f72fec8332d55d6d7dcdc545fab20..30b266f82d1ab136adb2984010953d5a912847fa 100644
--- a/content/browser/android/library_loader_hooks.cc
+++ b/content/browser/android/library_loader_hooks.cc
@@ -72,6 +72,8 @@ jboolean LibraryLoaderEntryHook(JNIEnv* env, jclass clazz,
   return JNI_TRUE;
 }
 
+namespace content {
+
 void LibraryLoaderExitHook() {
   if (g_at_exit_manager) {
     delete g_at_exit_manager;
@@ -98,3 +100,5 @@ bool RegisterLibraryLoaderEntryHook(JNIEnv* env) {
   }
   return true;
 }
+
+}  // namespace content