Cleanup: Remove unneeded extensions #includes.

chrome/browser/download/download_target_determiner_unittest.cc

Index: chrome/browser/download/download_target_determiner_unittest.cc
diff --git a/chrome/browser/download/download_target_determiner_unittest.cc b/chrome/browser/download/download_target_determiner_unittest.cc
index dac46c7e92521638b67486358ab2b64b841d54df..7c15435108d18ab28040d2981bffaf9ff942ea55 100644
--- a/chrome/browser/download/download_target_determiner_unittest.cc
+++ b/chrome/browser/download/download_target_determiner_unittest.cc
@@ -31,7 +31,6 @@
 #include "content/public/test/mock_download_item.h"
 #include "content/public/test/test_renderer_host.h"
 #include "content/public/test/web_contents_tester.h"
-#include "extensions/common/extension.h"
 #include "net/base/mime_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -42,6 +41,10 @@
 #include "content/public/common/webplugininfo.h"
 #endif
 
+#if defined(ENABLE_EXTENSIONS)
+#include "extensions/common/extension.h"
+#endif
+
 using ::testing::AnyNumber;
 using ::testing::Invoke;
 using ::testing::Ref;
@@ -1147,7 +1150,7 @@ TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_PromptAlways) {
                              arraysize(kPromptingTestCases));
 }
 
-#if !defined(OS_ANDROID)
+#if defined(ENABLE_EXTENSIONS)
 // These test cases are run with "Prompt for download" user preference set to
 // true. Automatic extension downloads shouldn't cause prompting.
 // Android doesn't support extensions.
@@ -1204,7 +1207,7 @@ TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_PromptAlways_Extension) {
   RunTestCasesWithActiveItem(kPromptingTestCases,
                              arraysize(kPromptingTestCases));
 }
-#endif
+#endif  // defined(ENABLE_EXTENSIONS)
 
 // If the download path is managed, then we don't show any prompts.
 // Note that if the download path is managed, then PromptForDownload() is false.