Make TabBase non abstract

chrome/chrome_android.gypi

Index: chrome/chrome_android.gypi
diff --git a/chrome/chrome_android.gypi b/chrome/chrome_android.gypi
index 2b32666369da2071e5b0c0396200597a2a83bb20..e10880811fbb0b2b2a5c7aaa74d16cfe5fca8a76 100644
--- a/chrome/chrome_android.gypi
+++ b/chrome/chrome_android.gypi
@@ -16,7 +16,6 @@
       'dependencies': [
         '../base/base.gyp:base',
         'chrome_android_core',
-        'chromium_testshell_jni_headers',
         'chrome.gyp:browser_ui',
         '../content/content.gyp:content_app_browser',
       ],
@@ -28,8 +27,6 @@
         'android/testshell/chrome_main_delegate_testshell_android.h',
         "android/testshell/testshell_google_location_settings_helper.cc",
         "android/testshell/testshell_google_location_settings_helper.h",
-        'android/testshell/testshell_tab.cc',
-        'android/testshell/testshell_tab.h',
       ],
       'include_dirs': [
         '../skia/config',
@@ -72,18 +69,6 @@
       'includes': [ '../build/java_apk.gypi', ],
     },
     {
-      'target_name': 'chromium_testshell_jni_headers',
-      'type': 'none',
-      'sources': [
-        'android/testshell/java/src/org/chromium/chrome/testshell/TestShellTab.java',
-      ],
-      'variables': {
-        'jni_gen_package': 'chromium_testshell',
-        'jni_generator_ptr_type': 'long',
-      },
-      'includes': [ '../build/jni_generator.gypi' ],
-    },
-    {
       # chromium_testshell creates a .jar as a side effect. Any java targets
       # that need that .jar in their classpath should depend on this target,
       # chromium_testshell_java. Dependents of chromium_testshell receive its