diff --git a/content/base/src/nsObjectLoadingContent.cpp b/content/base/src/nsObjectLoadingContent.cpp
index 8bb42674d610..cb7c807a562d 100644
--- a/content/base/src/nsObjectLoadingContent.cpp
+++ b/content/base/src/nsObjectLoadingContent.cpp
@@ -671,8 +671,7 @@ nsObjectLoadingContent::nsObjectLoadingContent()
   , mPlayPreviewCanceled(false)
   , mIsStopping(false)
   , mIsLoading(false)
-  , mScriptRequested(false)
-  , mSrcStreamLoading(false) {}
+  , mScriptRequested(false) {}
 
 nsObjectLoadingContent::~nsObjectLoadingContent()
 {
@@ -1251,7 +1250,7 @@ nsObjectLoadingContent::UpdateObjectParameters()
         // XXX(johns): Our de-facto behavior since forever was to refuse to load
         // Objects who don't have a classid we support, regardless of other type
         // or uri info leads to a valid plugin.
-        newMime.Assign("");
+        newMime.Truncate();
         stateInvalid = true;
       }
     }
@@ -1371,7 +1370,7 @@ nsObjectLoadingContent::UpdateObjectParameters()
     if (NS_FAILED(rv)) {
       NS_NOTREACHED("GetContentType failed");
       stateInvalid = true;
-      channelType.Assign("");
+      channelType.Truncate();
     }
 
     LOG(("OBJLC [%p]: Channel has a content type of %s", this, channelType.get()));
diff --git a/content/base/src/nsObjectLoadingContent.h b/content/base/src/nsObjectLoadingContent.h
index ebd8741e6e63..97733ce1edd0 100644
--- a/content/base/src/nsObjectLoadingContent.h
+++ b/content/base/src/nsObjectLoadingContent.h
@@ -26,8 +26,6 @@
 
 class nsAsyncInstantiateEvent;
 class nsStopPluginRunnable;
-class AutoNotifier;
-class AutoFallback;
 class AutoSetInstantiatingToFalse;
 class nsObjectFrame;
 class nsFrameLoader;
@@ -132,12 +130,6 @@ class nsObjectLoadingContent : public nsImageLoadingContent
      */
     void NotifyOwnerDocumentActivityChanged();
 
-    /**
-     * Used by pluginHost to know if we're loading with a channel, so it
-     * will not open its own.
-     */
-    bool SrcStreamLoading() { return mSrcStreamLoading; }
-
     /**
      * When a plug-in is instantiated, it can create a scriptable
      * object that the page wants to interact with.  We expose this
@@ -526,14 +518,6 @@ class nsObjectLoadingContent : public nsImageLoadingContent
     // whether content js has tried to access the plugin script object.
     bool                        mScriptRequested : 1;
 
-    // Used to track when we might try to instantiate a plugin instance based on
-    // a src data stream being delivered to this object. When this is true we
-    // don't want plugin instance instantiation code to attempt to load src data
-    // again or we'll deliver duplicate streams. Should be cleared when we are
-    // not loading src data.
-    bool                        mSrcStreamLoading : 1;
-
-
     nsWeakFrame                 mPrintFrame;
 
     nsRefPtr<nsPluginInstanceOwner> mInstanceOwner;