Remove remaining dependency on test_runner from components.

components/test_runner/test_common.cc

Index: components/test_runner/test_common.cc
diff --git a/components/test_runner/test_common.cc b/components/test_runner/test_common.cc
index 4d295815b122a78bbf8a1fea92ed7568335c14f3..3639e7c75810a6c6e966730e52ff879a3c45805f 100644
--- a/components/test_runner/test_common.cc
+++ b/components/test_runner/test_common.cc
@@ -9,9 +9,8 @@
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/rand_util.h"
-#include "third_party/WebKit/public/platform/Platform.h"
-#include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebNavigationPolicy.h"
+#include "url/gurl.h"
 
 namespace test_runner {
 
@@ -25,22 +24,6 @@ const char file_test_prefix[] = "(file test):";
 const char data_url_pattern[] = "data:";
 const std::string::size_type data_url_pattern_size =
     sizeof(data_url_pattern) - 1;
-
-// This mock is used to initialize blink.
-class MockBlinkPlatform : NON_EXPORTED_BASE(public blink::Platform) {
- public:
-  MockBlinkPlatform() {
-    blink::Platform::initialize(this);
-  }
-  ~MockBlinkPlatform() override {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MockBlinkPlatform);
-};
-
-base::LazyInstance<MockBlinkPlatform>::Leaky g_mock_blink_platform =
-    LAZY_INSTANCE_INITIALIZER;
-
 const char* kIllegalString = "illegal value";
 const char* kPolicyIgnore = "Ignore";
 const char* kPolicyDownload = "download";
@@ -102,8 +85,4 @@ blink::WebString V8StringToWebString(v8::Local<v8::String> v8_str) {
   return blink::WebString::fromUTF8(chars.get());
 }
 
-void EnsureBlinkInitialized() {
-  g_mock_blink_platform.Get();
-}
-
 }  // namespace test_runner