Include .h file instead of .cc file, fixing linking problem

In some builds there were duplicate symbols because a cc file
was compiled twice and linked with itself. This happened because
some code accidentally included the cc file instead of the header.

Change-Id: Ifa145ce13190a9fa855e06986ca60605005aa9fc
Reviewed-on: https://chromium-review.googlesource.com/1255824
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595853}

chrome/browser/chromeos/accessibility/dictation_chromeos.cc

@@ -16,7 +16,7 @@
 #include "media/audio/sounds/sounds_manager.h"
 #include "services/network/public/cpp/shared_url_loader_factory.h"
 #include "ui/base/ime/chromeos/extension_ime_util.h"
-#include "ui/base/ime/chromeos/input_method_util.cc"
+#include "ui/base/ime/chromeos/input_method_util.h"
 #include "ui/base/ime/composition_text.h"
 #include "ui/base/ime/ime_bridge.h"
 #include "ui/base/ime/ime_input_context_handler_interface.h"