Put the Pepper stuff in the content namespace.

content/renderer/pepper/pepper_platform_video_capture_impl.h

Index: content/renderer/pepper/pepper_platform_video_capture_impl.h
diff --git a/content/renderer/pepper/pepper_platform_video_capture_impl.h b/content/renderer/pepper/pepper_platform_video_capture_impl.h
index 07fd27574e85ffdc5122a72c3343cf225e16a9c0..9eb7504eefbcdef11472a4abda6cfada77bfbac7 100644
--- a/content/renderer/pepper/pepper_platform_video_capture_impl.h
+++ b/content/renderer/pepper/pepper_platform_video_capture_impl.h
@@ -15,12 +15,14 @@
 #include "media/video/capture/video_capture.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 
-class PepperPluginDelegateImpl;
-
 namespace media {
 class VideoCaptureHandlerProxy;
 }
 
+namespace content {
+
+class PepperPluginDelegateImpl;
+
 class PepperPlatformVideoCaptureImpl
     : public webkit::ppapi::PluginDelegate::PlatformVideoCapture,
       public media::VideoCapture::EventHandler {
@@ -80,4 +82,6 @@ class PepperPlatformVideoCaptureImpl
   DISALLOW_COPY_AND_ASSIGN(PepperPlatformVideoCaptureImpl);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_VIDEO_CAPTURE_IMPL_H_