browser: Put simple_message_box.h and chrome_web_contents_view_delegate.h into chrome namespace.

chrome/browser/extensions/extension_error_reporter.cc

Index: chrome/browser/extensions/extension_error_reporter.cc
diff --git a/chrome/browser/extensions/extension_error_reporter.cc b/chrome/browser/extensions/extension_error_reporter.cc
index 6f85a744f738600a13e5e24d27545cb78f90b8e6..e5abe83451f483fe17a07ab1b936b7c2211555b8 100644
--- a/chrome/browser/extensions/extension_error_reporter.cc
+++ b/chrome/browser/extensions/extension_error_reporter.cc
@@ -56,8 +56,8 @@ void ExtensionErrorReporter::ReportError(const string16& message,
   LOG(ERROR) << "Extension error: " << message;
 
   if (enable_noisy_errors_ && be_noisy) {
-    browser::ShowMessageBox(NULL, ASCIIToUTF16("Extension error"), message,
-                            browser::MESSAGE_BOX_TYPE_WARNING);
+    chrome::ShowMessageBox(NULL, ASCIIToUTF16("Extension error"), message,
+                           chrome::MESSAGE_BOX_TYPE_WARNING);
   }
 }