Apply automatic range checks to /chrome enum types across IPC.

This is part of a long-running background task to remove the remaining
uses of the unchecked IPC_ENUM_TRAITS() macro.

BUG=246708

Review URL: https://codereview.chromium.org/598393002

Cr-Commit-Position: refs/heads/master@{#297135}

chrome/common/render_messages.h

@@ -84,7 +84,8 @@ IPC_ENUM_TRAITS_MAX_VALUE(ChromeViewHostMsg_GetPluginInfo_Status::Value,
                           ChromeViewHostMsg_GetPluginInfo_Status::kUnauthorized)
 IPC_ENUM_TRAITS(OmniboxFocusChangeReason)
 IPC_ENUM_TRAITS(OmniboxFocusState)
-IPC_ENUM_TRAITS(search_provider::OSDDType)
+IPC_ENUM_TRAITS_MAX_VALUE(search_provider::OSDDType,
+                          search_provider::OSDD_TYPE_LAST)
 IPC_ENUM_TRAITS(search_provider::InstallState)
 IPC_ENUM_TRAITS(ThemeBackgroundImageAlignment)
 IPC_ENUM_TRAITS(ThemeBackgroundImageTiling)

chrome/common/search_provider.h

@@ -14,6 +14,7 @@ enum OSDDType {
 
   // The Open Search Description URL was given by Javascript.
   EXPLICIT_PROVIDER,
+  OSDD_TYPE_LAST = EXPLICIT_PROVIDER
 };
 
 // The install state of the search provider (not installed, installed, default).