Move a bunch of code in content\common (as well as a few left in renderer) to the content namespace.

content/common/indexed_db/indexed_db_dispatcher_unittest.cc

Index: content/common/indexed_db/indexed_db_dispatcher_unittest.cc
===================================================================
--- content/common/indexed_db/indexed_db_dispatcher_unittest.cc	(revision 163290)
+++ content/common/indexed_db/indexed_db_dispatcher_unittest.cc	(working copy)
@@ -12,11 +12,11 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBCallbacks.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBTransaction.h"
 
-using content::IndexedDBKey;
-using content::SerializedScriptValue;
 using WebKit::WebVector;
 using WebKit::WebString;
 
+namespace content {
+
 class FakeWebIDBTransaction : public WebKit::WebIDBTransaction {
  public:
   FakeWebIDBTransaction() {}
@@ -48,3 +48,5 @@
     EXPECT_NE(ec, 0);
   }
 }
+
+}  // namespace content