--- a/gfx/webrender_bindings/Moz2DImageRenderer.cpp
+++ b/gfx/webrender_bindings/Moz2DImageRenderer.cpp
@@ -9,17 +9,16 @@
 #include "mozilla/Range.h"
 #include "mozilla/gfx/2D.h"
 #include "mozilla/gfx/InlineTranslator.h"
 #include "mozilla/gfx/Logging.h"
 #include "mozilla/gfx/RecordedEvent.h"
 #include "WebRenderTypes.h"
 #include "webrender_ffi.h"
 
-#include <iostream>
 #include <unordered_map>
 
 #ifdef XP_MACOSX
 #include "mozilla/gfx/UnscaledFontMac.h"
 #elif defined(XP_WIN)
 #include "mozilla/gfx/UnscaledFontDWrite.h"
 #else
 #include "mozilla/gfx/UnscaledFontFreeType.h"

--- a/layout/base/nsLayoutDebugger.cpp
+++ b/layout/base/nsLayoutDebugger.cpp
@@ -12,17 +12,16 @@
 #include "nsILayoutDebugger.h"
 
 #include "nsAttrValue.h"
 #include "nsFrame.h"
 #include "nsDisplayList.h"
 #include "FrameLayerBuilder.h"
 #include "nsPrintfCString.h"
 
-#include <iostream>
 #include <stdio.h>
 
 using namespace mozilla;
 using namespace mozilla::layers;
 
 #ifdef DEBUG
 class nsLayoutDebugger : public nsILayoutDebugger {
 public:
@@ -262,25 +261,25 @@ nsFrame::PrintDisplayList(nsDisplayListB
 /**
  * The two functions below are intended to be called from a debugger.
  */
 void
 PrintDisplayItemToStdout(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem)
 {
   std::stringstream stream;
   PrintDisplayItemTo(aBuilder, aItem, stream, 0, true, false);
-  std::cout << stream.str() << std::endl;
+  puts(stream.str().c_str());
 }
 
 void
 PrintDisplayListToStdout(nsDisplayListBuilder* aBuilder, const nsDisplayList& aList)
 {
   std::stringstream stream;
   PrintDisplayListTo(aBuilder, aList, stream, 0, false);
-  std::cout << stream.str() << std::endl;
+  puts(stream.str().c_str());
 }
 
 #ifdef MOZ_DUMP_PAINTING
 static void
 PrintDisplayListSetItem(nsDisplayListBuilder* aBuilder,
                         const char* aItemName,
                         const nsDisplayList& aList,
                         std::stringstream& aStream,

--- a/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.cpp
+++ b/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.cpp
@@ -1,15 +1,14 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "WebrtcGmpVideoCodec.h"
 
-#include <iostream>
 #include <vector>
 
 #include "mozilla/CheckedInt.h"
 #include "mozilla/IntegerPrintfMacros.h"
 #include "mozilla/Move.h"
 #include "mozilla/SyncRunnable.h"
 #include "VideoConduit.h"
 #include "AudioConduit.h"

--- a/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.h
+++ b/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.h
@@ -28,17 +28,16 @@
  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WEBRTCGMPVIDEOCODEC_H_
 #define WEBRTCGMPVIDEOCODEC_H_
 
-#include <iostream>
 #include <queue>
 #include <string>
 
 #include "nsThreadUtils.h"
 #include "mozilla/Monitor.h"
 #include "mozilla/Mutex.h"
 
 #include "mozIGeckoMediaPluginService.h"

--- a/media/webrtc/signaling/src/media-conduit/WebrtcMediaCodecVP8VideoCodec.cpp
+++ b/media/webrtc/signaling/src/media-conduit/WebrtcMediaCodecVP8VideoCodec.cpp
@@ -1,14 +1,13 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include <cstdio>
-#include <iostream>
 #include <queue>
 
 #include "CSFLog.h"
 #include "nspr.h"
 
 #include "JavaCallbacksSupport.h"
 #include "MediaCodec.h"
 #include "WebrtcMediaCodecVP8VideoCodec.h"

--- a/security/sandbox/chromium-shim/sandbox/win/loggingCallbacks.h
+++ b/security/sandbox/chromium-shim/sandbox/win/loggingCallbacks.h
@@ -3,17 +3,16 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef security_sandbox_loggingCallbacks_h__
 #define security_sandbox_loggingCallbacks_h__
 
 #include <sstream>
-#include <iostream>
 
 #include "mozilla/Logging.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/sandboxing/loggingTypes.h"
 #include "nsContentUtils.h"
 
 #include "mozilla/StackWalk.h"