Fix require statements.

Also throw error instead of string.
And stop using goog.asserts.

core/dragged_connection_manager.js

@@ -29,8 +29,6 @@ goog.provide('Blockly.DraggedConnectionManager');
 goog.require('Blockly.BlockAnimations');
 goog.require('Blockly.RenderedConnection');
 
-goog.require('goog.math.Coordinate');
-
 
 /**
  * Class that controls updates to connections during drags.  It is primarily

core/field_colour.js

@@ -29,7 +29,7 @@ goog.provide('Blockly.FieldColour');
 goog.require('Blockly.DropDownDiv');
 goog.require('Blockly.Field');
 
-goog.require('goog.style');
+goog.require('goog.math.Size');
 
 
 /**

core/flyout_base.js

@@ -37,7 +37,7 @@ goog.require('Blockly.utils');
 goog.require('Blockly.WorkspaceSvg');
 goog.require('Blockly.Xml');
 
-goog.require('goog.math.Rect');
+goog.require('goog.math.Coordinate');
 
 
 /**

core/insertion_marker_manager.js

@@ -30,8 +30,6 @@ goog.require('Blockly.BlockAnimations');
 goog.require('Blockly.Events.BlockMove');
 goog.require('Blockly.RenderedConnection');
 
-goog.require('goog.math.Coordinate');
-
 
 /**
  * Class that controls updates to connections during drags.  It is primarily
@@ -660,7 +658,8 @@ Blockly.InsertionMarkerManager.prototype.disconnectMarker_ = function() {
   }
 
   if (imConn.targetConnection) {
-    throw 'markerConnection_ still connected at the end of disconnectInsertionMarker';
+    throw Error('markerConnection_ still connected at the end of ' +
+        'disconnectInsertionMarker');
   }
 
   this.markerConnection_ = null;
@@ -679,8 +678,10 @@ Blockly.InsertionMarkerManager.prototype.connectMarker_ = function() {
   var imBlock = isLastInStack ? this.lastMarker_ : this.firstMarker_;
   var imConn = imBlock.getMatchingConnection(local.sourceBlock_, local);
 
-  goog.asserts.assert(imConn != this.markerConnection_,
-      'Made it to connectMarker_ even though the marker isn\'t changing');
+  if (imConn == this.markerConnection_) {
+    throw Error('Made it to connectMarker_ even though the marker isn\'t ' +
+        'changing');
+  }
 
   // Render disconnected from everything else so that we have a valid
   // connection location.

core/toolbox.js

@@ -35,10 +35,10 @@ goog.require('Blockly.VerticalFlyout');
 
 goog.require('goog.events');
 goog.require('goog.events.BrowserFeature');
+goog.require('goog.events.EventType');
 goog.require('goog.html.SafeHtml');
-goog.require('goog.html.SafeStyle');
 goog.require('goog.math.Rect');
-goog.require('goog.style');
+goog.require('goog.ui.tree.BaseNode');
 goog.require('goog.ui.tree.TreeControl');
 goog.require('goog.ui.tree.TreeNode');
 

core/ui_menu_utils.js

@@ -31,6 +31,8 @@
  */
 goog.provide('Blockly.utils.uiMenu');
 
+goog.require('goog.style');
+
 
 /**
  * Get the size of a rendered goog.ui.Menu.

core/utils.js

@@ -35,6 +35,7 @@ goog.provide('Blockly.utils');
 goog.require('Blockly.userAgent');
 
 goog.require('goog.math.Coordinate');
+goog.require('goog.style');
 
 
 /**