Move implementation from header to source.

chrome/browser/tabs/tab_strip_model.h

Index: chrome/browser/tabs/tab_strip_model.h
diff --git a/chrome/browser/tabs/tab_strip_model.h b/chrome/browser/tabs/tab_strip_model.h
index 4c1ad284e5d123a4c0c63a80157e8f89ba5b97cf..c00dbffee1b66eafca5fbbf8486fccdf044638a4 100644
--- a/chrome/browser/tabs/tab_strip_model.h
+++ b/chrome/browser/tabs/tab_strip_model.h
@@ -59,21 +59,21 @@ class TabStripModelObserver {
   // (selected).
   virtual void TabInsertedAt(TabContents* contents,
                              int index,
-                             bool foreground) {}
+                             bool foreground);
 
   // The specified TabContents at |index| is being closed (and eventually
   // destroyed).
-  virtual void TabClosingAt(TabContents* contents, int index) {}
+  virtual void TabClosingAt(TabContents* contents, int index);
 
   // The specified TabContents at |index| is being detached, perhaps to be
   // inserted in another TabStripModel. The implementer should take whatever
   // action is necessary to deal with the TabContents no longer being present.
-  virtual void TabDetachedAt(TabContents* contents, int index) {}
+  virtual void TabDetachedAt(TabContents* contents, int index);
 
   // The selected TabContents is about to change from |old_contents| at |index|.
   // This gives observers a chance to prepare for an impending switch before it
   // happens.
-  virtual void TabDeselectedAt(TabContents* contents, int index) {}
+  virtual void TabDeselectedAt(TabContents* contents, int index);
 
   // The selected TabContents changed from |old_contents| to |new_contents| at
   // |index|. |user_gesture| specifies whether or not this was done by a user
@@ -82,12 +82,12 @@ class TabStripModelObserver {
   virtual void TabSelectedAt(TabContents* old_contents,
                              TabContents* new_contents,
                              int index,
-                             bool user_gesture) {}
+                             bool user_gesture);
 
   // The specified TabContents at |from_index| was moved to |to_index|.
   virtual void TabMoved(TabContents* contents,
                         int from_index,
-                        int to_index) {}
+                        int to_index);
 
   // The specified TabContents at |index| changed in some way. |contents| may
   // be an entirely different object and the old value is no longer available
@@ -95,40 +95,40 @@ class TabStripModelObserver {
   //
   // See TabChangeType for a description of |change_type|.
   virtual void TabChangedAt(TabContents* contents, int index,
-                            TabChangeType change_type) {}
+                            TabChangeType change_type);
 
   // The tab contents was replaced at the specified index. This is invoked when
   // a tab becomes phantom. See description of phantom tabs in class description
   // of TabStripModel for details.
   virtual void TabReplacedAt(TabContents* old_contents,
-                             TabContents* new_contents, int index) {}
+                             TabContents* new_contents, int index);
 
   // Invoked when the pinned state of a tab changes. This is not invoked if the
   // tab ends up moving as a result of the mini state changing.
   // See note in TabMiniStateChanged as to how this relates to
   // TabMiniStateChanged.
-  virtual void TabPinnedStateChanged(TabContents* contents, int index) {}
+  virtual void TabPinnedStateChanged(TabContents* contents, int index);
 
   // Invoked if the mini state of a tab changes.  This is not invoked if the
   // tab ends up moving as a result of the mini state changing.
   // NOTE: this is sent when the pinned state of a non-app tab changes and is
   // sent in addition to TabPinnedStateChanged. UI code typically need not care
   // about TabPinnedStateChanged, but instead this.
-  virtual void TabMiniStateChanged(TabContents* contents, int index) {}
+  virtual void TabMiniStateChanged(TabContents* contents, int index);
 
   // Invoked when the blocked state of a tab changes.
   // NOTE: This is invoked when a tab becomes blocked/unblocked by a tab modal
   // window.
-  virtual void TabBlockedStateChanged(TabContents* contents, int index) {}
+  virtual void TabBlockedStateChanged(TabContents* contents, int index);
 
   // The TabStripModel now no longer has any phantom tabs. The implementer may
   // use this as a trigger to try and close the window containing the
   // TabStripModel, for example...
-  virtual void TabStripEmpty() {}
+  virtual void TabStripEmpty();
 
   // Sent when the tabstrip model is about to be deleted and any reference held
   // must be dropped.
-  virtual void TabStripModelDeleted() {}
+  virtual void TabStripModelDeleted();
 };
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -229,9 +229,7 @@ class TabStripModelDelegate {
   virtual void BookmarkAllTabs() = 0;
 
   // Returns true if any of the tabs can be closed.
-  virtual bool CanCloseTab() const {
-    return true;
-  }
+  virtual bool CanCloseTab() const;
 
   // Returns true if the vertical tabstrip presentation should be used.
   virtual bool UseVerticalTabs() const = 0;