WebGL functions returning strings should not return null

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc

Index: content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc
diff --git a/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc b/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc
index 46e74d7b17276ae59ba5039ab7101cd95e40bf43..1babbd94f0d90a5e69c32ea6edf6a07c4fcc7fab 100644
--- a/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc
+++ b/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc
@@ -711,10 +711,10 @@ WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getProgramInfoLog(
   GLint logLength = 0;
   gl_->GetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
   if (!logLength)
-    return WebKit::WebString();
+    return WebKit::WebString("");
   scoped_array<GLchar> log(new GLchar[logLength]);
   if (!log.get())
-    return WebKit::WebString();
+    return WebKit::WebString("");
   GLsizei returnedLogLength = 0;
   gl_->GetProgramInfoLog(
       program, logLength, &returnedLogLength, log.get());
@@ -734,10 +734,10 @@ WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getShaderInfoLog(
   GLint logLength = 0;
   gl_->GetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
   if (!logLength)
-    return WebKit::WebString();
+    return WebKit::WebString("");
   scoped_array<GLchar> log(new GLchar[logLength]);
   if (!log.get())
-    return WebKit::WebString();
+    return WebKit::WebString("");
   GLsizei returnedLogLength = 0;
   gl_->GetShaderInfoLog(
       shader, logLength, &returnedLogLength, log.get());