C++11 declares a type safe null pointer

content/common/gpu/client/gl_helper.cc

Index: content/common/gpu/client/gl_helper.cc
diff --git a/content/common/gpu/client/gl_helper.cc b/content/common/gpu/client/gl_helper.cc
index 5aa603038fd1ac79b0a7ee7ef038574f6aa1fd9b..346d2f2e97b8e55591bc39d5c47c0a6669be9660 100644
--- a/content/common/gpu/client/gl_helper.cc
+++ b/content/common/gpu/client/gl_helper.cc
@@ -58,7 +58,7 @@ class TextureFrameBufferPair {
                    0,
                    GL_RGBA,
                    GL_UNSIGNED_BYTE,
-                   NULL);
+                   nullptr);
     content::ScopedFramebufferBinder<GL_FRAMEBUFFER> framebuffer_binder(
         gl, framebuffer_);
     gl->FramebufferTexture2D(
@@ -411,7 +411,7 @@ GLuint GLHelper::CopyTextureToImpl::ScaleTexture(
                     0,
                     format,
                     type,
-                    NULL);
+                    nullptr);
   }
   scoped_ptr<ScalerInterface> scaler(
       helper_->CreateScaler(quality,
@@ -445,7 +445,7 @@ GLuint GLHelper::CopyTextureToImpl::EncodeTextureAsGrayscale(
                     0,
                     GL_RGBA,
                     GL_UNSIGNED_BYTE,
-                    NULL);
+                    nullptr);
   }
 
   helper_->InitScalerImpl();
@@ -480,7 +480,7 @@ void GLHelper::CopyTextureToImpl::ReadbackAsync(
   gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, request->buffer);
   gl_->BufferData(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM,
                   bytes_per_pixel * dst_size.GetArea(),
-                  NULL,
+                  nullptr,
                   GL_STREAM_READ);
 
   request->query = 0u;
@@ -492,7 +492,7 @@ void GLHelper::CopyTextureToImpl::ReadbackAsync(
                   dst_size.height(),
                   format,
                   type,
-                  NULL);
+                  nullptr);
   gl_->EndQueryEXT(GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM);
   gl_->BindBuffer(GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM, 0);
   context_support_->SignalQuery(
@@ -966,7 +966,7 @@ void GLHelper::ResizeTexture(GLuint texture, const gfx::Size& size) {
                   0,
                   GL_RGB,
                   GL_UNSIGNED_BYTE,
-                  NULL);
+                  nullptr);
 }
 
 void GLHelper::CopyTextureSubImage(GLuint texture, const gfx::Rect& rect) {
@@ -1210,7 +1210,7 @@ GLHelper::CopyTextureToImpl::ReadbackYUV_MRT::ReadbackYUV_MRT(
                  0,
                  GL_RGBA,
                  GL_UNSIGNED_BYTE,
-                 NULL);
+                 nullptr);
 
   DCHECK(!(dst_size.width() & 1));
   DCHECK(!(dst_size.height() & 1));