Bug 726416 - Fix some content/ build warnings; r=mounir

content/base/src/nsDocument.cpp

@@ -8120,7 +8120,7 @@ nsIDocument::ScheduleFrameRequestCallback(nsIFrameRequestCallback* aCallback,
   PRInt32 newHandle = ++mFrameRequestCallbackCounter;
 
   bool alreadyRegistered = !mFrameRequestCallbacks.IsEmpty();
-  FrameRequest *request =
+  DebugOnly<FrameRequest*> request =
     mFrameRequestCallbacks.AppendElement(FrameRequest(aCallback, newHandle));
   NS_ASSERTION(request, "This is supposed to be infallible!");
   if (!alreadyRegistered && mPresShell && IsEventHandlingEnabled()) {
@@ -8303,11 +8303,8 @@ nsDocument::RemoveImage(imgIRequest* aImage)
   NS_ENSURE_ARG_POINTER(aImage);
 
   // Get the old count. It should exist and be > 0.
-  PRUint32 count;
-#ifdef DEBUG
-  bool found =
-#endif
-  mImageTracker.Get(aImage, &count);
+  PRUint32 count = 0;
+  DebugOnly<bool> found = mImageTracker.Get(aImage, &count);
   NS_ABORT_IF_FALSE(found, "Removing image that wasn't in the tracker!");
   NS_ABORT_IF_FALSE(count > 0, "Entry in the cache tracker with count 0!");
 

content/base/src/nsFrameMessageManager.cpp

@@ -349,7 +349,8 @@ class MMListenerRemover
 {
 public:
   MMListenerRemover(nsFrameMessageManager* aMM)
-  : mMM(aMM), mWasHandlingMessage(aMM->mHandlingMessage)
+    : mWasHandlingMessage(aMM->mHandlingMessage)
+    , mMM(aMM)
   {
     mMM->mHandlingMessage = true;
   }

content/media/nsBuiltinDecoder.cpp

@@ -327,7 +327,9 @@ nsresult nsBuiltinDecoder::Seek(double aTime)
   PRInt32 range = 0;
   if (!IsInRanges(seekable, aTime, range)) {
     if (range != -1) {
-      if (range + 1 < length) {
+      // |range + 1| can't be negative, because the only possible negative value
+      // for |range| is -1.
+      if (PRUint32(range + 1) < length) {
         double leftBound, rightBound;
         res = seekable.End(range, &leftBound);
         NS_ENSURE_SUCCESS(res, NS_OK);

content/media/nsBuiltinDecoderStateMachine.cpp

@@ -49,6 +49,7 @@
 
 #include "mozilla/Preferences.h"
 #include "mozilla/StdInt.h"
+#include "mozilla/Util.h"
 
 using namespace mozilla;
 using namespace mozilla::layers;
@@ -307,9 +308,8 @@ void StateMachineTracker::EnsureGlobalStateMachine()
   ReentrantMonitorAutoEnter mon(mMonitor);
   if (mStateMachineCount == 0) {
     NS_ASSERTION(!mStateMachineThread, "Should have null state machine thread!");
-    nsresult res = NS_NewThread(&mStateMachineThread,
-                                nsnull);
-    NS_ABORT_IF_FALSE(NS_SUCCEEDED(res), "Can't create media state machine thread");
+    DebugOnly<nsresult> rv = NS_NewThread(&mStateMachineThread, nsnull);
+    NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv), "Can't create media state machine thread");
   }
   mStateMachineCount++;
 }