Add missing (and remove superfluous) 'explicit' from constructors.

cc/resource_update_controller_unittest.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resource_update_controller.h"
 
 #include "cc/single_thread_proxy.h" // For DebugScopedSetImplThread
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/fake_proxy.h"
 #include "cc/test/fake_web_graphics_context_3d.h"
 #include "cc/test/scheduler_test_common.h"
 #include "cc/test/tiled_layer_test_common.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 
 using namespace WebKit;
 using testing::Test;
 
 namespace cc {
 namespace {
 
 const int kFlushPeriodFull = 4;
 const int kFlushPeriodPartial = kFlushPeriodFull;
 
 class ResourceUpdateControllerTest;
 
 class WebGraphicsContext3DForUploadTest : public FakeWebGraphicsContext3D {
 public:
-    WebGraphicsContext3DForUploadTest(ResourceUpdateControllerTest *test)
+    explicit WebGraphicsContext3DForUploadTest(ResourceUpdateControllerTest *test)
         : m_test(test)
         , m_supportShallowFlush(true)
     { }
 
     virtual void flush(void);
     virtual void shallowFlushCHROMIUM(void);
     virtual void texSubImage2D(WGC3Denum target,
                                WGC3Dint level,
                                WGC3Dint xoffset,
                                WGC3Dint yoffset,
@@ skipping 456 matching lines @@
             runPendingTask(&thread, controller.get());
     }
 
     EXPECT_FALSE(thread.hasPendingTask());
     EXPECT_TRUE(client.readyToFinalizeCalled());
     EXPECT_EQ(2, m_numTotalUploads);
 }
 
 }  // namespace
 }  // namespace cc