Put the Pepper stuff in the content namespace.

content/renderer/pepper/pepper_platform_image_2d_impl.cc

Index: content/renderer/pepper/pepper_platform_image_2d_impl.cc
diff --git a/content/renderer/pepper/pepper_platform_image_2d_impl.cc b/content/renderer/pepper/pepper_platform_image_2d_impl.cc
index bf02e79fcf9f2f864505d3b807fec6d3a3430980..a609ae837799c0d8daeb3c33134c23bcd360f988 100644
--- a/content/renderer/pepper/pepper_platform_image_2d_impl.cc
+++ b/content/renderer/pepper/pepper_platform_image_2d_impl.cc
@@ -9,6 +9,8 @@
 #include "content/renderer/render_thread_impl.h"
 #include "ui/gfx/surface/transport_dib.h"
 
+namespace content {
+
 PepperPlatformImage2DImpl::PepperPlatformImage2DImpl(int width,
                                                      int height,
                                                      TransportDIB* dib)
@@ -80,3 +82,5 @@ intptr_t PepperPlatformImage2DImpl::GetSharedMemoryHandle(
 TransportDIB* PepperPlatformImage2DImpl::GetTransportDIB() const {
   return dib_.get();
 }
+
+}  // namespace content