[content shell] move code common to several processes to a common dir

content/shell/common/shell_messages.cc

Index: content/shell/common/shell_messages.cc
diff --git a/content/shell/shell_messages.cc b/content/shell/common/shell_messages.cc
similarity index 70%
rename from content/shell/shell_messages.cc
rename to content/shell/common/shell_messages.cc
index 422299f65cc5a27f9aaf980a52cebc21107cbf4f..3eae912b154213ccac84c59624e31d1b6e59bc39 100644
--- a/content/shell/shell_messages.cc
+++ b/content/shell/common/shell_messages.cc
@@ -4,30 +4,30 @@
 
 // Get basic type definitions.
 #define IPC_MESSAGE_IMPL
-#include "content/shell/shell_messages.h"
+#include "content/shell/common/shell_messages.h"
 
 // Generate constructors.
 #include "ipc/struct_constructor_macros.h"
-#include "content/shell/shell_messages.h"
+#include "content/shell/common/shell_messages.h"
 
 // Generate destructors.
 #include "ipc/struct_destructor_macros.h"
-#include "content/shell/shell_messages.h"
+#include "content/shell/common/shell_messages.h"
 
 // Generate param traits write methods.
 #include "ipc/param_traits_write_macros.h"
 namespace IPC {
-#include "content/shell/shell_messages.h"
+#include "content/shell/common/shell_messages.h"
 }  // namespace IPC
 
 // Generate param traits read methods.
 #include "ipc/param_traits_read_macros.h"
 namespace IPC {
-#include "content/shell/shell_messages.h"
+#include "content/shell/common/shell_messages.h"
 }  // namespace IPC
 
 // Generate param traits log methods.
 #include "ipc/param_traits_log_macros.h"
 namespace IPC {
-#include "content/shell/shell_messages.h"
+#include "content/shell/common/shell_messages.h"
 }  // namespace IPC