Move c/r/extensions/* into extensions namespace

chrome/renderer/extensions/json_schema_unittest.cc

Index: chrome/renderer/extensions/json_schema_unittest.cc
diff --git a/chrome/renderer/extensions/json_schema_unittest.cc b/chrome/renderer/extensions/json_schema_unittest.cc
index 8eb45811b370c1d7734a1d7010705813609a3e5e..9aaa4590499da0574b316ce2675b94fa965f3ed9 100644
--- a/chrome/renderer/extensions/json_schema_unittest.cc
+++ b/chrome/renderer/extensions/json_schema_unittest.cc
@@ -15,6 +15,8 @@
 static const char kJsonSchema[] = "json_schema.js";
 static const char kJsonSchemaTest[] = "json_schema_test.js";
 
+namespace extensions {
+
 class JsonSchemaTest : public V8UnitTest {
  public:
   JsonSchemaTest() {}
@@ -106,3 +108,5 @@ TEST_F(JsonSchemaTest, TestIsValidSchemaType) {
 TEST_F(JsonSchemaTest, TestCheckSchemaOverlap) {
   TestFunction("testCheckSchemaOverlap");
 }
+
+}  // namespace extensions